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<div class="title">executor.hpp</div>  </div>
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<a href="executor_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="preprocessor">#pragma once</span></div><div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;</div><div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="preprocessor">#include &quot;tsq.hpp&quot;</span></div><div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="preprocessor">#include &quot;notifier.hpp&quot;</span></div><div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="observer_8hpp.html">observer.hpp</a>&quot;</span></div><div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="preprocessor">#include &quot;taskflow.hpp&quot;</span></div><div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;</div><div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespacetf.html">tf</a> {</div><div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;</div><div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;</div><div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment">// ----------------------------------------------------------------------------</span></div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment">// Executor Definition</span></div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="comment">// ----------------------------------------------------------------------------</span></div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;</div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;</div><div class="line"><a name="l00028"></a><span class="lineno"><a class="line" href="classtf_1_1Executor.html">   28</a></span>&#160;<span class="keyword">class </span><a class="code" href="classtf_1_1Executor.html">Executor</a> {</div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;</div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;  <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="classtf_1_1FlowBuilder.html">FlowBuilder</a>;</div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;  <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="classtf_1_1Subflow.html">Subflow</a>;</div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;  <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="classtf_1_1cudaFlow.html">cudaFlow</a>;</div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;</div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;  <span class="keyword">struct </span>Worker {</div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;    <span class="keywordtype">size_t</span> id;</div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;    <span class="keywordtype">size_t</span> vtm;</div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;    Domain domain;</div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;    <a class="code" href="classtf_1_1Executor.html">Executor</a>* executor;</div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;    Notifier::Waiter* waiter;</div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/numeric/random/mersenne_twister_engine.html">std::mt19937</a> rdgen { <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/numeric/random/random_device.html">std::random_device</a>{}() };</div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;    TaskQueue&lt;Node*&gt; wsq[NUM_DOMAINS];</div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;  };</div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;    </div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;  <span class="keyword">struct </span>PerThread {</div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    Worker* worker {<span class="keyword">nullptr</span>};</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;  };</div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="comment">//#ifdef TF_ENABLE_CUDA</span></div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="comment">//  struct cudaDevice {</span></div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="comment">//    std::vector&lt;cudaStream_t&gt; streams;</span></div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="comment">//  };</span></div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="comment">//#endif</span></div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;</div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;  <span class="keyword">public</span>:</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;</div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="preprocessor">#ifdef TF_ENABLE_CUDA    </span></div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;</div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;    <span class="keyword">explicit</span> <a class="code" href="classtf_1_1Executor.html#a342562766963b1bbf65225803d93c071">Executor</a>(</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;      <span class="keywordtype">size_t</span> N = <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/thread/hardware_concurrency.html">std::thread::hardware_concurrency</a>(),</div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;      <span class="keywordtype">size_t</span> M = <a class="code" href="cuda__device_8hpp.html#abffa70155a5f160b7ceb86ee52ab2136">cuda_get_num_devices</a>()</div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;    );</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="preprocessor">#else</span></div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;    <span class="keyword">explicit</span> <a class="code" href="classtf_1_1Executor.html#a342562766963b1bbf65225803d93c071">Executor</a>(<span class="keywordtype">size_t</span> N = <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/thread/hardware_concurrency.html">std::thread::hardware_concurrency</a>());</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;    </div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    <a class="code" href="classtf_1_1Executor.html#a5a511b0cc23b264826373d3dabcef670">~Executor</a>();</div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;</div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/future.html">std::future&lt;void&gt;</a> <a class="code" href="classtf_1_1Executor.html#a81f35d5b0a20ac0646447eb80d97c0aa">run</a>(<a class="code" href="classtf_1_1Taskflow.html">Taskflow</a>&amp; taskflow);</div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;</div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;    <span class="keyword">template</span>&lt;<span class="keyword">typename</span> C&gt;</div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;    <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/future.html">std::future&lt;void&gt;</a> <a class="code" href="classtf_1_1Executor.html#a81f35d5b0a20ac0646447eb80d97c0aa">run</a>(<a class="code" href="classtf_1_1Taskflow.html">Taskflow</a>&amp; taskflow, C&amp;&amp; callable);</div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;</div><div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;    <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/future.html">std::future&lt;void&gt;</a> <a class="code" href="classtf_1_1Executor.html#adca6cd0ce1bd7e6fa2ed2a55c9ae15e6">run_n</a>(<a class="code" href="classtf_1_1Taskflow.html">Taskflow</a>&amp; taskflow, <span class="keywordtype">size_t</span> N);</div><div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;</div><div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160; 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   <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/atomic/atomic.html">std::atomic&lt;bool&gt;</a>   _done {0};</div><div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160;    </div><div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;    <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/container/unordered_set.html">std::unordered_set&lt;std::shared_ptr&lt;ObserverInterface&gt;</a>&gt; _observers;</div><div class="line"><a name="l00244"></a><span class="lineno">  244</span>&#160;</div><div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160;    <a class="code" href="classtf_1_1TFProfObserver.html">TFProfObserver</a>* _tfprof;</div><div class="line"><a name="l00246"></a><span class="lineno">  246</span>&#160; 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   <span class="keywordtype">void</span> _observer_epilogue(Worker&amp;, Node*);</div><div class="line"><a name="l00255"></a><span class="lineno">  255</span>&#160;    <span class="keywordtype">void</span> _spawn(<span class="keywordtype">size_t</span>, Domain);</div><div class="line"><a name="l00256"></a><span class="lineno">  256</span>&#160;    <span class="keywordtype">void</span> _worker_loop(Worker&amp;);</div><div class="line"><a name="l00257"></a><span class="lineno">  257</span>&#160;    <span class="keywordtype">void</span> _exploit_task(Worker&amp;, Node*&amp;);</div><div class="line"><a name="l00258"></a><span class="lineno">  258</span>&#160;    <span class="keywordtype">void</span> _explore_task(Worker&amp;, Node*&amp;);</div><div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160;    <span class="keywordtype">void</span> _schedule(Node*);</div><div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;    <span class="keywordtype">void</span> _schedule(<a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;Node*&gt;</a>&amp;);</div><div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160; 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   <span class="keywordtype">void</span> _invoke_cudaflow_task(Worker&amp;, Node*);</div><div class="line"><a name="l00277"></a><span class="lineno">  277</span>&#160;    </div><div class="line"><a name="l00278"></a><span class="lineno">  278</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> C, std::enable_if_t&lt;</div><div class="line"><a name="l00279"></a><span class="lineno">  279</span>&#160;      std::is_invocable_r_v&lt;void, C, cudaFlow&amp;&gt;, <span class="keywordtype">void</span>&gt;* = <span class="keyword">nullptr</span></div><div class="line"><a name="l00280"></a><span class="lineno">  280</span>&#160;    &gt;</div><div class="line"><a name="l00281"></a><span class="lineno">  281</span>&#160;    <span class="keywordtype">void</span> _invoke_cudaflow_task_entry(C&amp;&amp;, Node*);</div><div class="line"><a name="l00282"></a><span class="lineno">  282</span>&#160;    </div><div class="line"><a name="l00283"></a><span class="lineno">  283</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> C, std::enable_if_t&lt;</div><div class="line"><a name="l00284"></a><span class="lineno">  284</span>&#160;      std::is_invocable_r_v&lt;void, C, cudaFlowCapturer&amp;&gt;, <span class="keywordtype">void</span>&gt;* = <span class="keyword">nullptr</span></div><div class="line"><a name="l00285"></a><span class="lineno">  285</span>&#160;    &gt;</div><div class="line"><a name="l00286"></a><span class="lineno">  286</span>&#160;    <span class="keywordtype">void</span> _invoke_cudaflow_task_entry(C&amp;&amp;, Node*);</div><div class="line"><a name="l00287"></a><span class="lineno">  287</span>&#160;    </div><div class="line"><a name="l00288"></a><span class="lineno">  288</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> P&gt;</div><div class="line"><a name="l00289"></a><span class="lineno">  289</span>&#160;    <span class="keywordtype">void</span> _invoke_cudaflow_task_internal(Worker&amp;, <a class="code" href="classtf_1_1cudaFlow.html">cudaFlow</a>&amp;, P&amp;&amp;, <span class="keywordtype">bool</span>);</div><div class="line"><a name="l00290"></a><span class="lineno">  290</span>&#160;    </div><div class="line"><a name="l00291"></a><span class="lineno">  291</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> P&gt;</div><div class="line"><a name="l00292"></a><span class="lineno">  292</span>&#160;    <span class="keywordtype">void</span> _invoke_cudaflow_task_external(<a class="code" href="classtf_1_1cudaFlow.html">cudaFlow</a>&amp;, P&amp;&amp;, <span class="keywordtype">bool</span>);</div><div class="line"><a name="l00293"></a><span class="lineno">  293</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00294"></a><span class="lineno">  294</span>&#160;};</div><div class="line"><a name="l00295"></a><span class="lineno">  295</span>&#160;</div><div class="line"><a name="l00296"></a><span class="lineno">  296</span>&#160;</div><div class="line"><a name="l00297"></a><span class="lineno">  297</span>&#160;<span class="preprocessor">#ifdef TF_ENABLE_CUDA</span></div><div class="line"><a name="l00298"></a><span class="lineno">  298</span>&#160;<span class="comment">// Constructor</span></div><div class="line"><a name="l00299"></a><span class="lineno"><a class="line" href="classtf_1_1Executor.html#a342562766963b1bbf65225803d93c071">  299</a></span>&#160;<span class="keyword">inline</span> <a class="code" href="classtf_1_1Executor.html#a342562766963b1bbf65225803d93c071">Executor::Executor</a>(<span class="keywordtype">size_t</span> N, <span class="keywordtype">size_t</span> M) :</div><div class="line"><a name="l00300"></a><span class="lineno">  300</span>&#160;  _VICTIM_BEG   {0},</div><div class="line"><a name="l00301"></a><span class="lineno">  301</span>&#160;  _VICTIM_END   {N + M - 1},</div><div class="line"><a name="l00302"></a><span class="lineno">  302</span>&#160;  _MAX_STEALS   {(N + M + 1) &lt;&lt; 1},</div><div class="line"><a name="l00303"></a><span class="lineno">  303</span>&#160;  _MAX_YIELDS   {100},</div><div class="line"><a name="l00304"></a><span class="lineno">  304</span>&#160;  _workers      {N + M},</div><div class="line"><a name="l00305"></a><span class="lineno">  305</span>&#160;  _notifier     {Notifier(N), Notifier(M)} {</div><div class="line"><a name="l00306"></a><span class="lineno">  306</span>&#160;</div><div class="line"><a name="l00307"></a><span class="lineno">  307</span>&#160;  <span class="keywordflow">if</span>(N == 0) {</div><div class="line"><a name="l00308"></a><span class="lineno">  308</span>&#160;    TF_THROW(<span class="stringliteral">&quot;no cpu workers to execute taskflows&quot;</span>);</div><div class="line"><a name="l00309"></a><span class="lineno">  309</span>&#160; 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</div><div class="line"><a name="l00318"></a><span class="lineno">  318</span>&#160;  }</div><div class="line"><a name="l00319"></a><span class="lineno">  319</span>&#160;  </div><div class="line"><a name="l00320"></a><span class="lineno">  320</span>&#160;  _spawn(N, HOST);</div><div class="line"><a name="l00321"></a><span class="lineno">  321</span>&#160;  _spawn(M, CUDA);</div><div class="line"><a name="l00322"></a><span class="lineno">  322</span>&#160;</div><div class="line"><a name="l00323"></a><span class="lineno">  323</span>&#160;  <span class="comment">// initiate the observer if requested</span></div><div class="line"><a name="l00324"></a><span class="lineno">  324</span>&#160;  _instantiate_tfprof();</div><div class="line"><a name="l00325"></a><span class="lineno">  325</span>&#160;}</div><div class="line"><a name="l00326"></a><span class="lineno">  326</span>&#160;</div><div class="line"><a name="l00327"></a><span class="lineno">  327</span>&#160;<span class="preprocessor">#else</span></div><div class="line"><a name="l00328"></a><span class="lineno">  328</span>&#160;<span class="comment">// Constructor</span></div><div class="line"><a name="l00329"></a><span class="lineno"><a class="line" href="classtf_1_1Executor.html#a4910e89d89146b6d563d598b795eb4a9">  329</a></span>&#160;<span class="keyword">inline</span> <a class="code" href="classtf_1_1Executor.html#a342562766963b1bbf65225803d93c071">Executor::Executor</a>(<span class="keywordtype">size_t</span> N) : </div><div class="line"><a name="l00330"></a><span class="lineno">  330</span>&#160;  _VICTIM_BEG {0},</div><div class="line"><a name="l00331"></a><span class="lineno">  331</span>&#160;  _VICTIM_END {N - 1},</div><div class="line"><a name="l00332"></a><span class="lineno">  332</span>&#160;  _MAX_STEALS {(N + 1) &lt;&lt; 1},</div><div class="line"><a name="l00333"></a><span class="lineno">  333</span>&#160;  _MAX_YIELDS {100},</div><div class="line"><a name="l00334"></a><span class="lineno">  334</span>&#160;  _workers    {N},</div><div class="line"><a name="l00335"></a><span class="lineno">  335</span>&#160;  _notifier   {Notifier(N)} {</div><div class="line"><a name="l00336"></a><span class="lineno">  336</span>&#160;  </div><div class="line"><a name="l00337"></a><span class="lineno">  337</span>&#160;  <span class="keywordflow">if</span>(N == 0) {</div><div class="line"><a name="l00338"></a><span class="lineno">  338</span>&#160;    TF_THROW(<span class="stringliteral">&quot;no cpu workers to execute taskflows&quot;</span>);</div><div class="line"><a name="l00339"></a><span class="lineno">  339</span>&#160;  }</div><div class="line"><a name="l00340"></a><span class="lineno">  340</span>&#160;  </div><div class="line"><a name="l00341"></a><span class="lineno">  341</span>&#160;  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i=0; i&lt;NUM_DOMAINS; ++i) {</div><div class="line"><a name="l00342"></a><span class="lineno">  342</span>&#160;    _num_actives[i].store(0, std::memory_order_relaxed);</div><div class="line"><a name="l00343"></a><span class="lineno">  343</span>&#160;    _num_thieves[i].store(0, std::memory_order_relaxed); </div><div class="line"><a name="l00344"></a><span class="lineno">  344</span>&#160;  }</div><div class="line"><a name="l00345"></a><span class="lineno">  345</span>&#160;</div><div class="line"><a name="l00346"></a><span class="lineno">  346</span>&#160;  _spawn(N, HOST);</div><div class="line"><a name="l00347"></a><span class="lineno">  347</span>&#160;</div><div class="line"><a name="l00348"></a><span class="lineno">  348</span>&#160;  <span class="comment">// instantite the default observer if requested</span></div><div class="line"><a name="l00349"></a><span class="lineno">  349</span>&#160;  _instantiate_tfprof();</div><div class="line"><a name="l00350"></a><span class="lineno">  350</span>&#160;}</div><div class="line"><a name="l00351"></a><span class="lineno">  351</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00352"></a><span class="lineno">  352</span>&#160;</div><div class="line"><a name="l00353"></a><span class="lineno">  353</span>&#160;<span class="comment">// Destructor</span></div><div class="line"><a name="l00354"></a><span class="lineno"><a class="line" href="classtf_1_1Executor.html#a5a511b0cc23b264826373d3dabcef670">  354</a></span>&#160;<span class="keyword">inline</span> <a class="code" href="classtf_1_1Executor.html#a5a511b0cc23b264826373d3dabcef670">Executor::~Executor</a>() {</div><div class="line"><a name="l00355"></a><span class="lineno">  355</span>&#160;  </div><div class="line"><a name="l00356"></a><span class="lineno">  356</span>&#160;  <span class="comment">// wait for all topologies to complete</span></div><div class="line"><a name="l00357"></a><span class="lineno">  357</span>&#160;  <a class="code" href="classtf_1_1Executor.html#ab9aa252f70e9a40020a1e5a89d485b85">wait_for_all</a>();</div><div class="line"><a name="l00358"></a><span class="lineno">  358</span>&#160;  </div><div class="line"><a name="l00359"></a><span class="lineno">  359</span>&#160;  <span class="comment">// shut down the scheduler</span></div><div class="line"><a name="l00360"></a><span class="lineno">  360</span>&#160;  _done = <span class="keyword">true</span>;</div><div class="line"><a name="l00361"></a><span class="lineno">  361</span>&#160;</div><div class="line"><a name="l00362"></a><span class="lineno">  362</span>&#160;  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i=0; i&lt;NUM_DOMAINS; ++i) {</div><div class="line"><a name="l00363"></a><span class="lineno">  363</span>&#160;    _notifier[i].notify(<span class="keyword">true</span>);</div><div class="line"><a name="l00364"></a><span class="lineno">  364</span>&#160;  }</div><div class="line"><a name="l00365"></a><span class="lineno">  365</span>&#160;  </div><div class="line"><a name="l00366"></a><span class="lineno">  366</span>&#160;  <span class="keywordflow">for</span>(<span class="keyword">auto</span>&amp; t : _threads){</div><div class="line"><a name="l00367"></a><span class="lineno">  367</span>&#160;    t.join();</div><div class="line"><a name="l00368"></a><span class="lineno">  368</span>&#160;  } </div><div class="line"><a name="l00369"></a><span class="lineno">  369</span>&#160;  </div><div class="line"><a name="l00370"></a><span class="lineno">  370</span>&#160;  <span class="comment">// flush the default observer</span></div><div class="line"><a name="l00371"></a><span class="lineno">  371</span>&#160;  _flush_tfprof();</div><div class="line"><a name="l00372"></a><span class="lineno">  372</span>&#160;}</div><div class="line"><a name="l00373"></a><span class="lineno">  373</span>&#160;</div><div class="line"><a name="l00374"></a><span class="lineno">  374</span>&#160;<span class="comment">// Procedure: _instantiate_tfprof</span></div><div class="line"><a name="l00375"></a><span class="lineno">  375</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_instantiate_tfprof() {</div><div class="line"><a name="l00376"></a><span class="lineno">  376</span>&#160;  <span class="comment">// TF_OBSERVER_TYPE</span></div><div class="line"><a name="l00377"></a><span class="lineno">  377</span>&#160;  _tfprof = get_env(<span class="stringliteral">&quot;TF_ENABLE_PROFILER&quot;</span>).empty() ? </div><div class="line"><a name="l00378"></a><span class="lineno">  378</span>&#160;    nullptr : make_observer&lt;TFProfObserver&gt;().<span class="keyword">get</span>();</div><div class="line"><a name="l00379"></a><span class="lineno">  379</span>&#160;}</div><div class="line"><a name="l00380"></a><span class="lineno">  380</span>&#160;</div><div class="line"><a name="l00381"></a><span class="lineno">  381</span>&#160;<span class="comment">// Procedure: _flush_tfprof</span></div><div class="line"><a name="l00382"></a><span class="lineno">  382</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_flush_tfprof() {</div><div class="line"><a name="l00383"></a><span class="lineno">  383</span>&#160;  <span class="keywordflow">if</span>(_tfprof) {</div><div class="line"><a name="l00384"></a><span class="lineno">  384</span>&#160;    <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/io/basic_ostringstream.html">std::ostringstream</a> fpath;</div><div class="line"><a name="l00385"></a><span class="lineno">  385</span>&#160;    fpath &lt;&lt; get_env(<span class="stringliteral">&quot;TF_ENABLE_PROFILER&quot;</span>) &lt;&lt; _tfprof-&gt;_uuid &lt;&lt; <span class="stringliteral">&quot;.tfp&quot;</span>;</div><div class="line"><a name="l00386"></a><span class="lineno">  386</span>&#160;    <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/io/basic_ofstream.html">std::ofstream</a> ofs(fpath.str());</div><div class="line"><a name="l00387"></a><span class="lineno">  387</span>&#160;    _tfprof-&gt;<a class="code" href="classtf_1_1TFProfObserver.html#a663445b21a03abaccfd32b199b7b10a1">dump</a>(ofs);</div><div class="line"><a name="l00388"></a><span class="lineno">  388</span>&#160;  }</div><div class="line"><a name="l00389"></a><span class="lineno">  389</span>&#160;}</div><div class="line"><a name="l00390"></a><span class="lineno">  390</span>&#160;</div><div class="line"><a name="l00391"></a><span class="lineno">  391</span>&#160;<span class="comment">// Function: num_workers</span></div><div class="line"><a name="l00392"></a><span class="lineno"><a class="line" href="classtf_1_1Executor.html#a79223c7f32c9d715e725b8d775de2d29">  392</a></span>&#160;<span class="keyword">inline</span> <span class="keywordtype">size_t</span> <a class="code" href="classtf_1_1Executor.html#a79223c7f32c9d715e725b8d775de2d29">Executor::num_workers</a>()<span class="keyword"> const </span>{</div><div class="line"><a name="l00393"></a><span class="lineno">  393</span>&#160;  <span class="keywordflow">return</span> _workers.size();</div><div class="line"><a name="l00394"></a><span class="lineno">  394</span>&#160;}</div><div class="line"><a name="l00395"></a><span class="lineno">  395</span>&#160;</div><div class="line"><a name="l00396"></a><span class="lineno">  396</span>&#160;<span class="comment">// Function: num_domains</span></div><div class="line"><a name="l00397"></a><span class="lineno"><a class="line" href="classtf_1_1Executor.html#a8acfc81ae6a64989761ce229262c9a21">  397</a></span>&#160;<span class="keyword">inline</span> <span class="keywordtype">size_t</span> <a class="code" href="classtf_1_1Executor.html#a8acfc81ae6a64989761ce229262c9a21">Executor::num_domains</a>()<span class="keyword"> const </span>{</div><div class="line"><a name="l00398"></a><span class="lineno">  398</span>&#160;  <span class="keywordflow">return</span> NUM_DOMAINS;</div><div class="line"><a name="l00399"></a><span class="lineno">  399</span>&#160;}</div><div class="line"><a name="l00400"></a><span class="lineno">  400</span>&#160;</div><div class="line"><a name="l00401"></a><span class="lineno">  401</span>&#160;<span class="comment">// Function: num_topologies</span></div><div class="line"><a name="l00402"></a><span class="lineno"><a class="line" href="classtf_1_1Executor.html#a6d6c28ed58211e4c27a99571e5bf0b6c">  402</a></span>&#160;<span class="keyword">inline</span> <span class="keywordtype">size_t</span> <a class="code" href="classtf_1_1Executor.html#a6d6c28ed58211e4c27a99571e5bf0b6c">Executor::num_topologies</a>()<span class="keyword"> const </span>{</div><div class="line"><a name="l00403"></a><span class="lineno">  403</span>&#160;  <span class="keywordflow">return</span> _num_topologies;</div><div class="line"><a name="l00404"></a><span class="lineno">  404</span>&#160;}</div><div class="line"><a name="l00405"></a><span class="lineno">  405</span>&#160;    </div><div class="line"><a name="l00406"></a><span class="lineno">  406</span>&#160;<span class="comment">// Function: async</span></div><div class="line"><a name="l00407"></a><span class="lineno">  407</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> F, <span class="keyword">typename</span>... ArgsT&gt;</div><div class="line"><a name="l00408"></a><span class="lineno"><a class="line" href="classtf_1_1Executor.html#a1e6866c8f1b6a2e932f06d0b4eb032c0">  408</a></span>&#160;<span class="keyword">auto</span> <a class="code" href="classtf_1_1Executor.html#a1e6866c8f1b6a2e932f06d0b4eb032c0">Executor::async</a>(F&amp;&amp; f, ArgsT&amp;&amp;... args) {</div><div class="line"><a name="l00409"></a><span class="lineno">  409</span>&#160;</div><div class="line"><a name="l00410"></a><span class="lineno">  410</span>&#160;  _increment_topology();</div><div class="line"><a name="l00411"></a><span class="lineno">  411</span>&#160;</div><div class="line"><a name="l00412"></a><span class="lineno">  412</span>&#160;  <span class="keyword">using</span> R = <span class="keyword">typename</span> function_traits&lt;F&gt;::return_type;</div><div class="line"><a name="l00413"></a><span class="lineno">  413</span>&#160;</div><div class="line"><a name="l00414"></a><span class="lineno">  414</span>&#160;  <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/promise.html">std::promise&lt;R&gt;</a> p;</div><div class="line"><a name="l00415"></a><span class="lineno">  415</span>&#160;</div><div class="line"><a name="l00416"></a><span class="lineno">  416</span>&#160;  <span class="keyword">auto</span> fu = p.get_future();</div><div class="line"><a name="l00417"></a><span class="lineno">  417</span>&#160;</div><div class="line"><a name="l00418"></a><span class="lineno">  418</span>&#160;  Node* node;</div><div class="line"><a name="l00419"></a><span class="lineno">  419</span>&#160;  </div><div class="line"><a name="l00420"></a><span class="lineno">  420</span>&#160;  <span class="keywordflow">if</span> constexpr(std::is_same_v&lt;R, void&gt;) {</div><div class="line"><a name="l00421"></a><span class="lineno">  421</span>&#160;    node = node_pool.animate(</div><div class="line"><a name="l00422"></a><span class="lineno">  422</span>&#160;      std::in_place_type_t&lt;Node::AsyncTask&gt;{},</div><div class="line"><a name="l00423"></a><span class="lineno">  423</span>&#160;      [p=make_moc(std::move(p)), f=std::forward&lt;F&gt;(f), args...] () <span class="keyword">mutable</span> {</div><div class="line"><a name="l00424"></a><span class="lineno">  424</span>&#160;        f(args...);</div><div class="line"><a name="l00425"></a><span class="lineno">  425</span>&#160;        p.object.set_value();</div><div class="line"><a name="l00426"></a><span class="lineno">  426</span>&#160;      }</div><div class="line"><a name="l00427"></a><span class="lineno">  427</span>&#160;    );</div><div class="line"><a name="l00428"></a><span class="lineno">  428</span>&#160;  }</div><div class="line"><a name="l00429"></a><span class="lineno">  429</span>&#160;  <span class="keywordflow">else</span> {</div><div class="line"><a name="l00430"></a><span class="lineno">  430</span>&#160;    node = node_pool.animate(</div><div class="line"><a name="l00431"></a><span class="lineno">  431</span>&#160;      std::in_place_type_t&lt;Node::AsyncTask&gt;{},</div><div class="line"><a name="l00432"></a><span class="lineno">  432</span>&#160;      [p=make_moc(std::move(p)), f=std::forward&lt;F&gt;(f), args...] () <span class="keyword">mutable</span> {</div><div class="line"><a name="l00433"></a><span class="lineno">  433</span>&#160;        p.object.set_value(f(args...));</div><div class="line"><a name="l00434"></a><span class="lineno">  434</span>&#160;      }</div><div class="line"><a name="l00435"></a><span class="lineno">  435</span>&#160;    );</div><div class="line"><a name="l00436"></a><span class="lineno">  436</span>&#160;  };</div><div class="line"><a name="l00437"></a><span class="lineno">  437</span>&#160;</div><div class="line"><a name="l00438"></a><span class="lineno">  438</span>&#160;  _schedule(node);</div><div class="line"><a name="l00439"></a><span class="lineno">  439</span>&#160;</div><div class="line"><a name="l00440"></a><span class="lineno">  440</span>&#160;  <span class="keywordflow">return</span> fu;</div><div class="line"><a name="l00441"></a><span class="lineno">  441</span>&#160;}</div><div class="line"><a name="l00442"></a><span class="lineno">  442</span>&#160;</div><div class="line"><a name="l00443"></a><span class="lineno">  443</span>&#160;<span class="comment">// Function: _per_thread</span></div><div class="line"><a name="l00444"></a><span class="lineno">  444</span>&#160;<span class="keyword">inline</span> Executor::PerThread&amp; Executor::_per_thread()<span class="keyword"> const </span>{</div><div class="line"><a name="l00445"></a><span class="lineno">  445</span>&#160;  thread_local PerThread pt;</div><div class="line"><a name="l00446"></a><span class="lineno">  446</span>&#160;  <span class="keywordflow">return</span> pt;</div><div class="line"><a name="l00447"></a><span class="lineno">  447</span>&#160;}</div><div class="line"><a name="l00448"></a><span class="lineno">  448</span>&#160;</div><div class="line"><a name="l00449"></a><span class="lineno">  449</span>&#160;<span class="comment">// Function: this_worker_id</span></div><div class="line"><a name="l00450"></a><span class="lineno"><a class="line" href="classtf_1_1Executor.html#a6487d589cb1f6b078b69fd3bb1082345">  450</a></span>&#160;<span class="keyword">inline</span> <span class="keywordtype">int</span> <a class="code" href="classtf_1_1Executor.html#a6487d589cb1f6b078b69fd3bb1082345">Executor::this_worker_id</a>()<span class="keyword"> const </span>{</div><div class="line"><a name="l00451"></a><span class="lineno">  451</span>&#160;  <span class="keyword">auto</span> worker = _per_thread().worker;</div><div class="line"><a name="l00452"></a><span class="lineno">  452</span>&#160;  <span class="keywordflow">return</span> worker ? <span class="keyword">static_cast&lt;</span><span class="keywordtype">int</span><span class="keyword">&gt;</span>(worker-&gt;id) : -1;</div><div class="line"><a name="l00453"></a><span class="lineno">  453</span>&#160;}</div><div class="line"><a name="l00454"></a><span class="lineno">  454</span>&#160;</div><div class="line"><a name="l00455"></a><span class="lineno">  455</span>&#160;<span class="comment">// Procedure: _spawn</span></div><div class="line"><a name="l00456"></a><span class="lineno">  456</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_spawn(<span class="keywordtype">size_t</span> N, Domain d) {</div><div class="line"><a name="l00457"></a><span class="lineno">  457</span>&#160;  </div><div class="line"><a name="l00458"></a><span class="lineno">  458</span>&#160;  <span class="keyword">auto</span> <span class="keywordtype">id</span> = _threads.size();</div><div class="line"><a name="l00459"></a><span class="lineno">  459</span>&#160;</div><div class="line"><a name="l00460"></a><span class="lineno">  460</span>&#160;  _id_offset[d] = id;</div><div class="line"><a name="l00461"></a><span class="lineno">  461</span>&#160;</div><div class="line"><a name="l00462"></a><span class="lineno">  462</span>&#160;  <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i=0; i&lt;N; ++i, ++id) {</div><div class="line"><a name="l00463"></a><span class="lineno">  463</span>&#160;</div><div class="line"><a name="l00464"></a><span class="lineno">  464</span>&#160;    _workers[id].id = id;</div><div class="line"><a name="l00465"></a><span class="lineno">  465</span>&#160;    _workers[id].vtm = id;</div><div class="line"><a name="l00466"></a><span class="lineno">  466</span>&#160;    _workers[id].domain = d;</div><div class="line"><a name="l00467"></a><span class="lineno">  467</span>&#160;    _workers[id].executor = <span class="keyword">this</span>;</div><div class="line"><a name="l00468"></a><span class="lineno">  468</span>&#160;    _workers[id].waiter = &amp;_notifier[d]._waiters[i];</div><div class="line"><a name="l00469"></a><span class="lineno">  469</span>&#160;    </div><div class="line"><a name="l00470"></a><span class="lineno">  470</span>&#160;    _threads.emplace_back([<span class="keyword">this</span>] (Worker&amp; w) -&gt; <span class="keywordtype">void</span> {</div><div class="line"><a name="l00471"></a><span class="lineno">  471</span>&#160;</div><div class="line"><a name="l00472"></a><span class="lineno">  472</span>&#160;      PerThread&amp; pt = _per_thread();  </div><div class="line"><a name="l00473"></a><span class="lineno">  473</span>&#160;      pt.worker = &amp;w;</div><div class="line"><a name="l00474"></a><span class="lineno">  474</span>&#160;</div><div class="line"><a name="l00475"></a><span class="lineno">  475</span>&#160;      Node* t = <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00476"></a><span class="lineno">  476</span>&#160;</div><div class="line"><a name="l00477"></a><span class="lineno">  477</span>&#160;      <span class="comment">// must use 1 as condition instead of !done</span></div><div class="line"><a name="l00478"></a><span class="lineno">  478</span>&#160;      <span class="keywordflow">while</span>(1) {</div><div class="line"><a name="l00479"></a><span class="lineno">  479</span>&#160;        </div><div class="line"><a name="l00480"></a><span class="lineno">  480</span>&#160;        <span class="comment">// execute the tasks.</span></div><div class="line"><a name="l00481"></a><span class="lineno">  481</span>&#160;        _exploit_task(w, t);</div><div class="line"><a name="l00482"></a><span class="lineno">  482</span>&#160;</div><div class="line"><a name="l00483"></a><span class="lineno">  483</span>&#160;        <span class="comment">// wait for tasks</span></div><div class="line"><a name="l00484"></a><span class="lineno">  484</span>&#160;        <span class="keywordflow">if</span>(_wait_for_task(w, t) == <span class="keyword">false</span>) {</div><div class="line"><a name="l00485"></a><span class="lineno">  485</span>&#160;          <span class="keywordflow">break</span>;</div><div class="line"><a name="l00486"></a><span class="lineno">  486</span>&#160;        }</div><div class="line"><a name="l00487"></a><span class="lineno">  487</span>&#160;      }</div><div class="line"><a name="l00488"></a><span class="lineno">  488</span>&#160;      </div><div class="line"><a name="l00489"></a><span class="lineno">  489</span>&#160;    }, <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/utility/functional/ref.html">std::ref</a>(_workers[<span class="keywordtype">id</span>]));     </div><div class="line"><a name="l00490"></a><span class="lineno">  490</span>&#160;  }</div><div class="line"><a name="l00491"></a><span class="lineno">  491</span>&#160;</div><div class="line"><a name="l00492"></a><span class="lineno">  492</span>&#160;}</div><div class="line"><a name="l00493"></a><span class="lineno">  493</span>&#160;</div><div class="line"><a name="l00494"></a><span class="lineno">  494</span>&#160;<span class="comment">// Function: _explore_task</span></div><div class="line"><a name="l00495"></a><span class="lineno">  495</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_explore_task(Worker&amp; w, Node*&amp; t) {</div><div class="line"><a name="l00496"></a><span class="lineno">  496</span>&#160;  </div><div class="line"><a name="l00497"></a><span class="lineno">  497</span>&#160;  <span class="comment">//assert(_workers[w].wsq.empty());</span></div><div class="line"><a name="l00498"></a><span class="lineno">  498</span>&#160;  assert(!t);</div><div class="line"><a name="l00499"></a><span class="lineno">  499</span>&#160;</div><div class="line"><a name="l00500"></a><span class="lineno">  500</span>&#160;  <span class="keyword">const</span> <span class="keyword">auto</span> d = w.domain;</div><div class="line"><a name="l00501"></a><span class="lineno">  501</span>&#160;</div><div class="line"><a name="l00502"></a><span class="lineno">  502</span>&#160;  <span class="keywordtype">size_t</span> num_steals = 0;</div><div class="line"><a name="l00503"></a><span class="lineno">  503</span>&#160;  <span class="keywordtype">size_t</span> num_yields = 0;</div><div class="line"><a name="l00504"></a><span class="lineno">  504</span>&#160;</div><div class="line"><a name="l00505"></a><span class="lineno">  505</span>&#160;  <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/numeric/random/uniform_int_distribution.html">std::uniform_int_distribution&lt;size_t&gt;</a> rdvtm(_VICTIM_BEG, _VICTIM_END);</div><div class="line"><a name="l00506"></a><span class="lineno">  506</span>&#160;</div><div class="line"><a name="l00507"></a><span class="lineno">  507</span>&#160;  <span class="comment">//while(!_done) {</span></div><div class="line"><a name="l00508"></a><span class="lineno">  508</span>&#160;  <span class="comment">//</span></div><div class="line"><a name="l00509"></a><span class="lineno">  509</span>&#160;  <span class="comment">//  size_t vtm = rdvtm(w.rdgen);</span></div><div class="line"><a name="l00510"></a><span class="lineno">  510</span>&#160;  <span class="comment">//    </span></div><div class="line"><a name="l00511"></a><span class="lineno">  511</span>&#160;  <span class="comment">//  t = (vtm == w.id) ? _wsq[d].steal() : _workers[vtm].wsq[d].steal();</span></div><div class="line"><a name="l00512"></a><span class="lineno">  512</span>&#160;</div><div class="line"><a name="l00513"></a><span class="lineno">  513</span>&#160;  <span class="comment">//  if(t) {</span></div><div class="line"><a name="l00514"></a><span class="lineno">  514</span>&#160;  <span class="comment">//    break;</span></div><div class="line"><a name="l00515"></a><span class="lineno">  515</span>&#160;  <span class="comment">//  }</span></div><div class="line"><a name="l00516"></a><span class="lineno">  516</span>&#160;</div><div class="line"><a name="l00517"></a><span class="lineno">  517</span>&#160;  <span class="comment">//  if(num_steal++ &gt; _MAX_STEALS) {</span></div><div class="line"><a name="l00518"></a><span class="lineno">  518</span>&#160;  <span class="comment">//    std::this_thread::yield();</span></div><div class="line"><a name="l00519"></a><span class="lineno">  519</span>&#160;  <span class="comment">//    if(num_yields++ &gt; _MAX_YIELDS) {</span></div><div class="line"><a name="l00520"></a><span class="lineno">  520</span>&#160;  <span class="comment">//      break;</span></div><div class="line"><a name="l00521"></a><span class="lineno">  521</span>&#160;  <span class="comment">//    }</span></div><div class="line"><a name="l00522"></a><span class="lineno">  522</span>&#160;  <span class="comment">//  }</span></div><div class="line"><a name="l00523"></a><span class="lineno">  523</span>&#160;  <span class="comment">//}</span></div><div class="line"><a name="l00524"></a><span class="lineno">  524</span>&#160;</div><div class="line"><a name="l00525"></a><span class="lineno">  525</span>&#160;  <span class="keywordflow">do</span> {</div><div class="line"><a name="l00526"></a><span class="lineno">  526</span>&#160;    t = (w.id == w.vtm) ? _wsq[d].steal() : _workers[w.vtm].wsq[d].steal();</div><div class="line"><a name="l00527"></a><span class="lineno">  527</span>&#160;</div><div class="line"><a name="l00528"></a><span class="lineno">  528</span>&#160;    <span class="keywordflow">if</span>(t) {</div><div class="line"><a name="l00529"></a><span class="lineno">  529</span>&#160;      <span class="keywordflow">break</span>;</div><div class="line"><a name="l00530"></a><span class="lineno">  530</span>&#160;    }</div><div class="line"><a name="l00531"></a><span class="lineno">  531</span>&#160;    </div><div class="line"><a name="l00532"></a><span class="lineno">  532</span>&#160;    <span class="keywordflow">if</span>(num_steals++ &gt; _MAX_STEALS) {</div><div class="line"><a name="l00533"></a><span class="lineno">  533</span>&#160;      <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/yield.html">std::this_thread::yield</a>();</div><div class="line"><a name="l00534"></a><span class="lineno">  534</span>&#160;      <span class="keywordflow">if</span>(num_yields++ &gt; _MAX_YIELDS) {</div><div class="line"><a name="l00535"></a><span class="lineno">  535</span>&#160;        <span class="keywordflow">break</span>;</div><div class="line"><a name="l00536"></a><span class="lineno">  536</span>&#160;      }</div><div class="line"><a name="l00537"></a><span class="lineno">  537</span>&#160;    }</div><div class="line"><a name="l00538"></a><span class="lineno">  538</span>&#160;    </div><div class="line"><a name="l00539"></a><span class="lineno">  539</span>&#160;    w.vtm = rdvtm(w.rdgen);</div><div class="line"><a name="l00540"></a><span class="lineno">  540</span>&#160;  } <span class="keywordflow">while</span>(!_done);</div><div class="line"><a name="l00541"></a><span class="lineno">  541</span>&#160;</div><div class="line"><a name="l00542"></a><span class="lineno">  542</span>&#160;}</div><div class="line"><a name="l00543"></a><span class="lineno">  543</span>&#160;</div><div class="line"><a name="l00544"></a><span class="lineno">  544</span>&#160;<span class="comment">// Procedure: _exploit_task</span></div><div class="line"><a name="l00545"></a><span class="lineno">  545</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_exploit_task(Worker&amp; w, Node*&amp; t) {</div><div class="line"><a name="l00546"></a><span class="lineno">  546</span>&#160;  </div><div class="line"><a name="l00547"></a><span class="lineno">  547</span>&#160;  <span class="keywordflow">if</span>(t) {</div><div class="line"><a name="l00548"></a><span class="lineno">  548</span>&#160;</div><div class="line"><a name="l00549"></a><span class="lineno">  549</span>&#160;    <span class="keyword">const</span> <span class="keyword">auto</span> d = w.domain;</div><div class="line"><a name="l00550"></a><span class="lineno">  550</span>&#160;</div><div class="line"><a name="l00551"></a><span class="lineno">  551</span>&#160;    <span class="keywordflow">if</span>(_num_actives[d].fetch_add(1) == 0 &amp;&amp; _num_thieves[d] == 0) {</div><div class="line"><a name="l00552"></a><span class="lineno">  552</span>&#160;      _notifier[d].notify(<span class="keyword">false</span>);</div><div class="line"><a name="l00553"></a><span class="lineno">  553</span>&#160;    }</div><div class="line"><a name="l00554"></a><span class="lineno">  554</span>&#160;</div><div class="line"><a name="l00555"></a><span class="lineno">  555</span>&#160;    <span class="keywordflow">while</span>(t) {</div><div class="line"><a name="l00556"></a><span class="lineno">  556</span>&#160;      _invoke(w, t);</div><div class="line"><a name="l00557"></a><span class="lineno">  557</span>&#160;      </div><div class="line"><a name="l00558"></a><span class="lineno">  558</span>&#160;      <span class="comment">//if(t-&gt;_parent == nullptr) {</span></div><div class="line"><a name="l00559"></a><span class="lineno">  559</span>&#160;      <span class="comment">//  if(t-&gt;_topology-&gt;_join_counter.fetch_sub(1) == 1) {</span></div><div class="line"><a name="l00560"></a><span class="lineno">  560</span>&#160;      <span class="comment">//    _tear_down_topology(t-&gt;_topology);</span></div><div class="line"><a name="l00561"></a><span class="lineno">  561</span>&#160;      <span class="comment">//  }</span></div><div class="line"><a name="l00562"></a><span class="lineno">  562</span>&#160;      <span class="comment">//}</span></div><div class="line"><a name="l00563"></a><span class="lineno">  563</span>&#160;      <span class="comment">//else {  // joined subflow</span></div><div class="line"><a name="l00564"></a><span class="lineno">  564</span>&#160;      <span class="comment">//  t-&gt;_parent-&gt;_join_counter.fetch_sub(1);</span></div><div class="line"><a name="l00565"></a><span class="lineno">  565</span>&#160;      <span class="comment">//}</span></div><div class="line"><a name="l00566"></a><span class="lineno">  566</span>&#160;</div><div class="line"><a name="l00567"></a><span class="lineno">  567</span>&#160;      t = w.wsq[d].pop();</div><div class="line"><a name="l00568"></a><span class="lineno">  568</span>&#160;    }</div><div class="line"><a name="l00569"></a><span class="lineno">  569</span>&#160;</div><div class="line"><a name="l00570"></a><span class="lineno">  570</span>&#160;    --_num_actives[d];</div><div class="line"><a name="l00571"></a><span class="lineno">  571</span>&#160;  }</div><div class="line"><a name="l00572"></a><span class="lineno">  572</span>&#160;}</div><div class="line"><a name="l00573"></a><span class="lineno">  573</span>&#160;</div><div class="line"><a name="l00574"></a><span class="lineno">  574</span>&#160;<span class="comment">// Function: _wait_for_task</span></div><div class="line"><a name="l00575"></a><span class="lineno">  575</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">bool</span> Executor::_wait_for_task(Worker&amp; worker, Node*&amp; t) {</div><div class="line"><a name="l00576"></a><span class="lineno">  576</span>&#160;</div><div class="line"><a name="l00577"></a><span class="lineno">  577</span>&#160;  <span class="keyword">const</span> <span class="keyword">auto</span> d = worker.domain;</div><div class="line"><a name="l00578"></a><span class="lineno">  578</span>&#160;</div><div class="line"><a name="l00579"></a><span class="lineno">  579</span>&#160;  wait_for_task:</div><div class="line"><a name="l00580"></a><span class="lineno">  580</span>&#160;</div><div class="line"><a name="l00581"></a><span class="lineno">  581</span>&#160;  assert(!t);</div><div class="line"><a name="l00582"></a><span class="lineno">  582</span>&#160;</div><div class="line"><a name="l00583"></a><span class="lineno">  583</span>&#160;  ++_num_thieves[d];</div><div class="line"><a name="l00584"></a><span class="lineno">  584</span>&#160;</div><div class="line"><a name="l00585"></a><span class="lineno">  585</span>&#160;  explore_task:</div><div class="line"><a name="l00586"></a><span class="lineno">  586</span>&#160;</div><div class="line"><a name="l00587"></a><span class="lineno">  587</span>&#160;  _explore_task(worker, t);</div><div class="line"><a name="l00588"></a><span class="lineno">  588</span>&#160;</div><div class="line"><a name="l00589"></a><span class="lineno">  589</span>&#160;  <span class="keywordflow">if</span>(t) {</div><div class="line"><a name="l00590"></a><span class="lineno">  590</span>&#160;    <span class="keywordflow">if</span>(_num_thieves[d].fetch_sub(1) == 1) {</div><div class="line"><a name="l00591"></a><span class="lineno">  591</span>&#160;      _notifier[d].notify(<span class="keyword">false</span>);</div><div class="line"><a name="l00592"></a><span class="lineno">  592</span>&#160;    }</div><div class="line"><a name="l00593"></a><span class="lineno">  593</span>&#160;    <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00594"></a><span class="lineno">  594</span>&#160;  }</div><div class="line"><a name="l00595"></a><span class="lineno">  595</span>&#160;</div><div class="line"><a name="l00596"></a><span class="lineno">  596</span>&#160;  _notifier[d].prepare_wait(worker.waiter);</div><div class="line"><a name="l00597"></a><span class="lineno">  597</span>&#160;  </div><div class="line"><a name="l00598"></a><span class="lineno">  598</span>&#160;  <span class="comment">//if(auto vtm = _find_vtm(me); vtm != _workers.size()) {</span></div><div class="line"><a name="l00599"></a><span class="lineno">  599</span>&#160;  <span class="keywordflow">if</span>(!_wsq[d].empty()) {</div><div class="line"><a name="l00600"></a><span class="lineno">  600</span>&#160;</div><div class="line"><a name="l00601"></a><span class="lineno">  601</span>&#160;    _notifier[d].cancel_wait(worker.waiter);</div><div class="line"><a name="l00602"></a><span class="lineno">  602</span>&#160;    <span class="comment">//t = (vtm == me) ? _wsq.steal() : _workers[vtm].wsq.steal();</span></div><div class="line"><a name="l00603"></a><span class="lineno">  603</span>&#160;    </div><div class="line"><a name="l00604"></a><span class="lineno">  604</span>&#160;    t = _wsq[d].steal();  <span class="comment">// must steal here</span></div><div class="line"><a name="l00605"></a><span class="lineno">  605</span>&#160;    <span class="keywordflow">if</span>(t) {</div><div class="line"><a name="l00606"></a><span class="lineno">  606</span>&#160;      <span class="keywordflow">if</span>(_num_thieves[d].fetch_sub(1) == 1) {</div><div class="line"><a name="l00607"></a><span class="lineno">  607</span>&#160;        _notifier[d].notify(<span class="keyword">false</span>);</div><div class="line"><a name="l00608"></a><span class="lineno">  608</span>&#160;      }</div><div class="line"><a name="l00609"></a><span class="lineno">  609</span>&#160;      <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00610"></a><span class="lineno">  610</span>&#160;    }</div><div class="line"><a name="l00611"></a><span class="lineno">  611</span>&#160;    <span class="keywordflow">else</span> {</div><div class="line"><a name="l00612"></a><span class="lineno">  612</span>&#160;      worker.vtm = worker.id;</div><div class="line"><a name="l00613"></a><span class="lineno">  613</span>&#160;      <span class="keywordflow">goto</span> explore_task;</div><div class="line"><a name="l00614"></a><span class="lineno">  614</span>&#160;    }</div><div class="line"><a name="l00615"></a><span class="lineno">  615</span>&#160;  }</div><div class="line"><a name="l00616"></a><span class="lineno">  616</span>&#160;</div><div class="line"><a name="l00617"></a><span class="lineno">  617</span>&#160;  <span class="keywordflow">if</span>(_done) {</div><div class="line"><a name="l00618"></a><span class="lineno">  618</span>&#160;    _notifier[d].cancel_wait(worker.waiter);</div><div class="line"><a name="l00619"></a><span class="lineno">  619</span>&#160;    <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i=0; i&lt;NUM_DOMAINS; ++i) {</div><div class="line"><a name="l00620"></a><span class="lineno">  620</span>&#160;      _notifier[i].notify(<span class="keyword">true</span>);</div><div class="line"><a name="l00621"></a><span class="lineno">  621</span>&#160;    }</div><div class="line"><a name="l00622"></a><span class="lineno">  622</span>&#160;    --_num_thieves[d];</div><div class="line"><a name="l00623"></a><span class="lineno">  623</span>&#160;    <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00624"></a><span class="lineno">  624</span>&#160;  }</div><div class="line"><a name="l00625"></a><span class="lineno">  625</span>&#160;</div><div class="line"><a name="l00626"></a><span class="lineno">  626</span>&#160;  <span class="keywordflow">if</span>(_num_thieves[d].fetch_sub(1) == 1) {</div><div class="line"><a name="l00627"></a><span class="lineno">  627</span>&#160;    <span class="keywordflow">if</span>(_num_actives[d]) {</div><div class="line"><a name="l00628"></a><span class="lineno">  628</span>&#160;      _notifier[d].cancel_wait(worker.waiter);</div><div class="line"><a name="l00629"></a><span class="lineno">  629</span>&#160;      <span class="keywordflow">goto</span> wait_for_task;</div><div class="line"><a name="l00630"></a><span class="lineno">  630</span>&#160;    }</div><div class="line"><a name="l00631"></a><span class="lineno">  631</span>&#160;    <span class="comment">// check all domain queue again</span></div><div class="line"><a name="l00632"></a><span class="lineno">  632</span>&#160;    <span class="keywordflow">for</span>(<span class="keyword">auto</span>&amp; w : _workers) {</div><div class="line"><a name="l00633"></a><span class="lineno">  633</span>&#160;      <span class="keywordflow">if</span>(!w.wsq[d].empty()) {</div><div class="line"><a name="l00634"></a><span class="lineno">  634</span>&#160;        worker.vtm = w.id;</div><div class="line"><a name="l00635"></a><span class="lineno">  635</span>&#160;        _notifier[d].cancel_wait(worker.waiter);</div><div class="line"><a name="l00636"></a><span class="lineno">  636</span>&#160;        <span class="keywordflow">goto</span> wait_for_task;</div><div class="line"><a name="l00637"></a><span class="lineno">  637</span>&#160;      }</div><div class="line"><a name="l00638"></a><span class="lineno">  638</span>&#160;    }</div><div class="line"><a name="l00639"></a><span class="lineno">  639</span>&#160;  }</div><div class="line"><a name="l00640"></a><span class="lineno">  640</span>&#160;    </div><div class="line"><a name="l00641"></a><span class="lineno">  641</span>&#160;  <span class="comment">// Now I really need to relinguish my self to others</span></div><div class="line"><a name="l00642"></a><span class="lineno">  642</span>&#160;  _notifier[d].commit_wait(worker.waiter);</div><div class="line"><a name="l00643"></a><span class="lineno">  643</span>&#160;</div><div class="line"><a name="l00644"></a><span class="lineno">  644</span>&#160;  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00645"></a><span class="lineno">  645</span>&#160;}</div><div class="line"><a name="l00646"></a><span class="lineno">  646</span>&#160;</div><div class="line"><a name="l00647"></a><span class="lineno">  647</span>&#160;<span class="comment">// Function: make_observer    </span></div><div class="line"><a name="l00648"></a><span class="lineno">  648</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> Observer, <span class="keyword">typename</span>... Args&gt;</div><div class="line"><a name="l00649"></a><span class="lineno"><a class="line" href="classtf_1_1Executor.html#a3e68a0d779cfee1554c88c2596ae9000">  649</a></span>&#160;<a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/memory/shared_ptr.html">std::shared_ptr&lt;Observer&gt;</a> <a class="code" href="classtf_1_1Executor.html#a3e68a0d779cfee1554c88c2596ae9000">Executor::make_observer</a>(Args&amp;&amp;... args) {</div><div class="line"><a name="l00650"></a><span class="lineno">  650</span>&#160;</div><div class="line"><a name="l00651"></a><span class="lineno">  651</span>&#160;  static_assert(</div><div class="line"><a name="l00652"></a><span class="lineno">  652</span>&#160;    std::is_base_of_v&lt;ObserverInterface, Observer&gt;,</div><div class="line"><a name="l00653"></a><span class="lineno">  653</span>&#160;    <span class="stringliteral">&quot;Observer must be derived from ObserverInterface&quot;</span></div><div class="line"><a name="l00654"></a><span class="lineno">  654</span>&#160;  );</div><div class="line"><a name="l00655"></a><span class="lineno">  655</span>&#160;  </div><div class="line"><a name="l00656"></a><span class="lineno">  656</span>&#160;  <span class="comment">// use a local variable to mimic the constructor </span></div><div class="line"><a name="l00657"></a><span class="lineno">  657</span>&#160;  <span class="keyword">auto</span> ptr = std::make_shared&lt;Observer&gt;(std::forward&lt;Args&gt;(args)...);</div><div class="line"><a name="l00658"></a><span class="lineno">  658</span>&#160;  </div><div class="line"><a name="l00659"></a><span class="lineno">  659</span>&#160;  ptr-&gt;set_up(_workers.size());</div><div class="line"><a name="l00660"></a><span class="lineno">  660</span>&#160;</div><div class="line"><a name="l00661"></a><span class="lineno">  661</span>&#160;  _observers.emplace(std::static_pointer_cast&lt;ObserverInterface&gt;(ptr));</div><div class="line"><a name="l00662"></a><span class="lineno">  662</span>&#160;</div><div class="line"><a name="l00663"></a><span class="lineno">  663</span>&#160;  <span class="keywordflow">return</span> ptr;</div><div class="line"><a name="l00664"></a><span class="lineno">  664</span>&#160;}</div><div class="line"><a name="l00665"></a><span class="lineno">  665</span>&#160;</div><div class="line"><a name="l00666"></a><span class="lineno">  666</span>&#160;<span class="comment">// Procedure: remove_observer</span></div><div class="line"><a name="l00667"></a><span class="lineno">  667</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Observer&gt;</div><div class="line"><a name="l00668"></a><span class="lineno"><a class="line" href="classtf_1_1Executor.html#a31081f492c376f7b798de0e430534531">  668</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="classtf_1_1Executor.html#a31081f492c376f7b798de0e430534531">Executor::remove_observer</a>(<a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/memory/shared_ptr.html">std::shared_ptr&lt;Observer&gt;</a> ptr) {</div><div class="line"><a name="l00669"></a><span class="lineno">  669</span>&#160;  </div><div class="line"><a name="l00670"></a><span class="lineno">  670</span>&#160;  static_assert(</div><div class="line"><a name="l00671"></a><span class="lineno">  671</span>&#160;    std::is_base_of_v&lt;ObserverInterface, Observer&gt;,</div><div class="line"><a name="l00672"></a><span class="lineno">  672</span>&#160;    <span class="stringliteral">&quot;Observer must be derived from ObserverInterface&quot;</span></div><div class="line"><a name="l00673"></a><span class="lineno">  673</span>&#160;  );</div><div class="line"><a name="l00674"></a><span class="lineno">  674</span>&#160;</div><div class="line"><a name="l00675"></a><span class="lineno">  675</span>&#160;  _observers.erase(std::static_pointer_cast&lt;ObserverInterface&gt;(ptr));</div><div class="line"><a name="l00676"></a><span class="lineno">  676</span>&#160;}</div><div class="line"><a name="l00677"></a><span class="lineno">  677</span>&#160;</div><div class="line"><a name="l00678"></a><span class="lineno">  678</span>&#160;<span class="comment">// Function: num_observers</span></div><div class="line"><a name="l00679"></a><span class="lineno"><a class="line" href="classtf_1_1Executor.html#ab92083be20ea77b9fb3eb8ea2d26af68">  679</a></span>&#160;<span class="keyword">inline</span> <span class="keywordtype">size_t</span> <a class="code" href="classtf_1_1Executor.html#ab92083be20ea77b9fb3eb8ea2d26af68">Executor::num_observers</a>()<span class="keyword"> const </span>{</div><div class="line"><a name="l00680"></a><span class="lineno">  680</span>&#160;  <span class="keywordflow">return</span> _observers.size();</div><div class="line"><a name="l00681"></a><span class="lineno">  681</span>&#160;}</div><div class="line"><a name="l00682"></a><span class="lineno">  682</span>&#160;</div><div class="line"><a name="l00683"></a><span class="lineno">  683</span>&#160;<span class="comment">// Procedure: _schedule</span></div><div class="line"><a name="l00684"></a><span class="lineno">  684</span>&#160;<span class="comment">// The main procedure to schedule a give task node.</span></div><div class="line"><a name="l00685"></a><span class="lineno">  685</span>&#160;<span class="comment">// Each task node has two types of tasks - regular and subflow.</span></div><div class="line"><a name="l00686"></a><span class="lineno">  686</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_schedule(Node* node) {</div><div class="line"><a name="l00687"></a><span class="lineno">  687</span>&#160;  </div><div class="line"><a name="l00688"></a><span class="lineno">  688</span>&#160;  <span class="comment">//assert(_workers.size() != 0);</span></div><div class="line"><a name="l00689"></a><span class="lineno">  689</span>&#160;</div><div class="line"><a name="l00690"></a><span class="lineno">  690</span>&#160;  <span class="keyword">const</span> <span class="keyword">auto</span> d = node-&gt;domain();</div><div class="line"><a name="l00691"></a><span class="lineno">  691</span>&#160;  </div><div class="line"><a name="l00692"></a><span class="lineno">  692</span>&#160;  <span class="comment">// caller is a worker to this pool</span></div><div class="line"><a name="l00693"></a><span class="lineno">  693</span>&#160;  <span class="keyword">auto</span> worker = _per_thread().worker;</div><div class="line"><a name="l00694"></a><span class="lineno">  694</span>&#160;</div><div class="line"><a name="l00695"></a><span class="lineno">  695</span>&#160;  <span class="keywordflow">if</span>(worker != <span class="keyword">nullptr</span> &amp;&amp; worker-&gt;executor == <span class="keyword">this</span>) {</div><div class="line"><a name="l00696"></a><span class="lineno">  696</span>&#160;    worker-&gt;wsq[d].push(node);</div><div class="line"><a name="l00697"></a><span class="lineno">  697</span>&#160;    <span class="keywordflow">if</span>(worker-&gt;domain != d) {</div><div class="line"><a name="l00698"></a><span class="lineno">  698</span>&#160;      <span class="keywordflow">if</span>(_num_actives[d] == 0 &amp;&amp; _num_thieves[d] == 0) {</div><div class="line"><a name="l00699"></a><span class="lineno">  699</span>&#160;        _notifier[d].notify(<span class="keyword">false</span>);</div><div class="line"><a name="l00700"></a><span class="lineno">  700</span>&#160;      }</div><div class="line"><a name="l00701"></a><span class="lineno">  701</span>&#160;    }</div><div class="line"><a name="l00702"></a><span class="lineno">  702</span>&#160;    <span class="keywordflow">return</span>;</div><div class="line"><a name="l00703"></a><span class="lineno">  703</span>&#160;  }</div><div class="line"><a name="l00704"></a><span class="lineno">  704</span>&#160;</div><div class="line"><a name="l00705"></a><span class="lineno">  705</span>&#160;  <span class="comment">// other threads</span></div><div class="line"><a name="l00706"></a><span class="lineno">  706</span>&#160;  {</div><div class="line"><a name="l00707"></a><span class="lineno">  707</span>&#160;    <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/lock_guard.html">std::lock_guard&lt;std::mutex&gt;</a> <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/lock.html">lock</a>(_wsq_mutex);</div><div class="line"><a name="l00708"></a><span class="lineno">  708</span>&#160;    _wsq[d].push(node);</div><div class="line"><a name="l00709"></a><span class="lineno">  709</span>&#160;  }</div><div class="line"><a name="l00710"></a><span class="lineno">  710</span>&#160;</div><div class="line"><a name="l00711"></a><span class="lineno">  711</span>&#160;  _notifier[d].notify(<span class="keyword">false</span>);</div><div class="line"><a name="l00712"></a><span class="lineno">  712</span>&#160;}</div><div class="line"><a name="l00713"></a><span class="lineno">  713</span>&#160;</div><div class="line"><a name="l00714"></a><span class="lineno">  714</span>&#160;<span class="comment">// Procedure: _schedule</span></div><div class="line"><a name="l00715"></a><span class="lineno">  715</span>&#160;<span class="comment">// The main procedure to schedule a set of task nodes.</span></div><div class="line"><a name="l00716"></a><span class="lineno">  716</span>&#160;<span class="comment">// Each task node has two types of tasks - regular and subflow.</span></div><div class="line"><a name="l00717"></a><span class="lineno">  717</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_schedule(<a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;Node*&gt;</a>&amp; nodes) {</div><div class="line"><a name="l00718"></a><span class="lineno">  718</span>&#160;</div><div class="line"><a name="l00719"></a><span class="lineno">  719</span>&#160;  <span class="comment">//assert(_workers.size() != 0);</span></div><div class="line"><a name="l00720"></a><span class="lineno">  720</span>&#160;  </div><div class="line"><a name="l00721"></a><span class="lineno">  721</span>&#160;  <span class="comment">// We need to cacth the node count to avoid accessing the nodes</span></div><div class="line"><a name="l00722"></a><span class="lineno">  722</span>&#160;  <span class="comment">// vector while the parent topology is removed!</span></div><div class="line"><a name="l00723"></a><span class="lineno">  723</span>&#160;  <span class="keyword">const</span> <span class="keyword">auto</span> num_nodes = nodes.size();</div><div class="line"><a name="l00724"></a><span class="lineno">  724</span>&#160;  </div><div class="line"><a name="l00725"></a><span class="lineno">  725</span>&#160;  <span class="keywordflow">if</span>(num_nodes == 0) {</div><div class="line"><a name="l00726"></a><span class="lineno">  726</span>&#160;    <span class="keywordflow">return</span>;</div><div class="line"><a name="l00727"></a><span class="lineno">  727</span>&#160;  }</div><div class="line"><a name="l00728"></a><span class="lineno">  728</span>&#160;</div><div class="line"><a name="l00729"></a><span class="lineno">  729</span>&#160;  <span class="comment">// worker thread</span></div><div class="line"><a name="l00730"></a><span class="lineno">  730</span>&#160;  <span class="keyword">auto</span> worker = _per_thread().worker;</div><div class="line"><a name="l00731"></a><span class="lineno">  731</span>&#160;</div><div class="line"><a name="l00732"></a><span class="lineno">  732</span>&#160;  <span class="comment">// task counts</span></div><div class="line"><a name="l00733"></a><span class="lineno">  733</span>&#160;  <span class="keywordtype">size_t</span> tcount[NUM_DOMAINS] = {0};</div><div class="line"><a name="l00734"></a><span class="lineno">  734</span>&#160;</div><div class="line"><a name="l00735"></a><span class="lineno">  735</span>&#160;  <span class="keywordflow">if</span>(worker != <span class="keyword">nullptr</span> &amp;&amp; worker-&gt;executor == <span class="keyword">this</span>) {</div><div class="line"><a name="l00736"></a><span class="lineno">  736</span>&#160;    <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i=0; i&lt;num_nodes; ++i) {</div><div class="line"><a name="l00737"></a><span class="lineno">  737</span>&#160;      <span class="keyword">const</span> <span class="keyword">auto</span> d = nodes[i]-&gt;domain();</div><div class="line"><a name="l00738"></a><span class="lineno">  738</span>&#160;      worker-&gt;wsq[d].push(nodes[i]);</div><div class="line"><a name="l00739"></a><span class="lineno">  739</span>&#160;      tcount[d]++;</div><div class="line"><a name="l00740"></a><span class="lineno">  740</span>&#160;    }</div><div class="line"><a name="l00741"></a><span class="lineno">  741</span>&#160;    </div><div class="line"><a name="l00742"></a><span class="lineno">  742</span>&#160;    <span class="keywordflow">for</span>(<span class="keywordtype">int</span> d=0; d&lt;NUM_DOMAINS; ++d) {</div><div class="line"><a name="l00743"></a><span class="lineno">  743</span>&#160;      <span class="keywordflow">if</span>(tcount[d] &amp;&amp; d != worker-&gt;domain) {</div><div class="line"><a name="l00744"></a><span class="lineno">  744</span>&#160;        <span class="keywordflow">if</span>(_num_actives[d] == 0 &amp;&amp; _num_thieves[d] == 0) {</div><div class="line"><a name="l00745"></a><span class="lineno">  745</span>&#160;          _notifier[d].notify_n(tcount[d]);</div><div class="line"><a name="l00746"></a><span class="lineno">  746</span>&#160;        }</div><div class="line"><a name="l00747"></a><span class="lineno">  747</span>&#160;      }</div><div class="line"><a name="l00748"></a><span class="lineno">  748</span>&#160;    }</div><div class="line"><a name="l00749"></a><span class="lineno">  749</span>&#160;</div><div class="line"><a name="l00750"></a><span class="lineno">  750</span>&#160;    <span class="keywordflow">return</span>;</div><div class="line"><a name="l00751"></a><span class="lineno">  751</span>&#160;  }</div><div class="line"><a name="l00752"></a><span class="lineno">  752</span>&#160;  </div><div class="line"><a name="l00753"></a><span class="lineno">  753</span>&#160;  <span class="comment">// other threads</span></div><div class="line"><a name="l00754"></a><span class="lineno">  754</span>&#160;  {</div><div class="line"><a name="l00755"></a><span class="lineno">  755</span>&#160;    <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/lock_guard.html">std::lock_guard&lt;std::mutex&gt;</a> <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/lock.html">lock</a>(_wsq_mutex);</div><div class="line"><a name="l00756"></a><span class="lineno">  756</span>&#160;    <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> k=0; k&lt;num_nodes; ++k) {</div><div class="line"><a name="l00757"></a><span class="lineno">  757</span>&#160;      <span class="keyword">const</span> <span class="keyword">auto</span> d = nodes[k]-&gt;domain();</div><div class="line"><a name="l00758"></a><span class="lineno">  758</span>&#160;      _wsq[d].push(nodes[k]);</div><div class="line"><a name="l00759"></a><span class="lineno">  759</span>&#160;      tcount[d]++;</div><div class="line"><a name="l00760"></a><span class="lineno">  760</span>&#160;    }</div><div class="line"><a name="l00761"></a><span class="lineno">  761</span>&#160;  }</div><div class="line"><a name="l00762"></a><span class="lineno">  762</span>&#160;  </div><div class="line"><a name="l00763"></a><span class="lineno">  763</span>&#160;  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> d=0; d&lt;NUM_DOMAINS; ++d) {</div><div class="line"><a name="l00764"></a><span class="lineno">  764</span>&#160;    _notifier[d].notify_n(tcount[d]);</div><div class="line"><a name="l00765"></a><span class="lineno">  765</span>&#160;  }</div><div class="line"><a name="l00766"></a><span class="lineno">  766</span>&#160;}</div><div class="line"><a name="l00767"></a><span class="lineno">  767</span>&#160;</div><div class="line"><a name="l00768"></a><span class="lineno">  768</span>&#160;</div><div class="line"><a name="l00769"></a><span class="lineno">  769</span>&#160;<span class="comment">// Procedure: _invoke</span></div><div class="line"><a name="l00770"></a><span class="lineno">  770</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_invoke(Worker&amp; worker, Node* node) {</div><div class="line"><a name="l00771"></a><span class="lineno">  771</span>&#160;</div><div class="line"><a name="l00772"></a><span class="lineno">  772</span>&#160;  <span class="comment">//assert(_workers.size() != 0);</span></div><div class="line"><a name="l00773"></a><span class="lineno">  773</span>&#160;</div><div class="line"><a name="l00774"></a><span class="lineno">  774</span>&#160;  <span class="comment">// Here we need to fetch the num_successors first to avoid the invalid memory</span></div><div class="line"><a name="l00775"></a><span class="lineno">  775</span>&#160;  <span class="comment">// access caused by topology clear.</span></div><div class="line"><a name="l00776"></a><span class="lineno">  776</span>&#160;  <span class="keyword">const</span> <span class="keyword">auto</span> num_successors = node-&gt;num_successors();</div><div class="line"><a name="l00777"></a><span class="lineno">  777</span>&#160;  </div><div class="line"><a name="l00778"></a><span class="lineno">  778</span>&#160;  <span class="comment">// task type</span></div><div class="line"><a name="l00779"></a><span class="lineno">  779</span>&#160;  <span class="keyword">auto</span> type = node-&gt;_handle.index();</div><div class="line"><a name="l00780"></a><span class="lineno">  780</span>&#160;  </div><div class="line"><a name="l00781"></a><span class="lineno">  781</span>&#160;  <span class="comment">// condition task</span></div><div class="line"><a name="l00782"></a><span class="lineno">  782</span>&#160;  <span class="keywordtype">int</span> cond = -1;</div><div class="line"><a name="l00783"></a><span class="lineno">  783</span>&#160;  </div><div class="line"><a name="l00784"></a><span class="lineno">  784</span>&#160;  <span class="comment">// switch is faster than nested if-else due to jump table</span></div><div class="line"><a name="l00785"></a><span class="lineno">  785</span>&#160;  <span class="keywordflow">switch</span>(type) {</div><div class="line"><a name="l00786"></a><span class="lineno">  786</span>&#160;    <span class="comment">// static task</span></div><div class="line"><a name="l00787"></a><span class="lineno">  787</span>&#160;    <span class="keywordflow">case</span> Node::STATIC_TASK:{</div><div class="line"><a name="l00788"></a><span class="lineno">  788</span>&#160;      _invoke_static_task(worker, node);</div><div class="line"><a name="l00789"></a><span class="lineno">  789</span>&#160;    } </div><div class="line"><a name="l00790"></a><span class="lineno">  790</span>&#160;    <span class="keywordflow">break</span>;</div><div class="line"><a name="l00791"></a><span class="lineno">  791</span>&#160;    </div><div class="line"><a name="l00792"></a><span class="lineno">  792</span>&#160;    <span class="comment">// dynamic task</span></div><div class="line"><a name="l00793"></a><span class="lineno">  793</span>&#160;    <span class="keywordflow">case</span> Node::DYNAMIC_TASK: {</div><div class="line"><a name="l00794"></a><span class="lineno">  794</span>&#160;      _invoke_dynamic_task(worker, node);</div><div class="line"><a name="l00795"></a><span class="lineno">  795</span>&#160;    }</div><div class="line"><a name="l00796"></a><span class="lineno">  796</span>&#160;    <span class="keywordflow">break</span>;</div><div class="line"><a name="l00797"></a><span class="lineno">  797</span>&#160;    </div><div class="line"><a name="l00798"></a><span class="lineno">  798</span>&#160;    <span class="comment">// condition task</span></div><div class="line"><a name="l00799"></a><span class="lineno">  799</span>&#160;    <span class="keywordflow">case</span> Node::CONDITION_TASK: {</div><div class="line"><a name="l00800"></a><span class="lineno">  800</span>&#160;      _invoke_condition_task(worker, node, cond);</div><div class="line"><a name="l00801"></a><span class="lineno">  801</span>&#160;    }</div><div class="line"><a name="l00802"></a><span class="lineno">  802</span>&#160;    <span class="keywordflow">break</span>;</div><div class="line"><a name="l00803"></a><span class="lineno">  803</span>&#160;    <span class="comment">//}  // no need to add a break here due to the immediate return</span></div><div class="line"><a name="l00804"></a><span class="lineno">  804</span>&#160;</div><div class="line"><a name="l00805"></a><span class="lineno">  805</span>&#160;    <span class="comment">// module task</span></div><div class="line"><a name="l00806"></a><span class="lineno">  806</span>&#160;    <span class="keywordflow">case</span> Node::MODULE_TASK: {</div><div class="line"><a name="l00807"></a><span class="lineno">  807</span>&#160;      _invoke_module_task(worker, node);</div><div class="line"><a name="l00808"></a><span class="lineno">  808</span>&#160;    }</div><div class="line"><a name="l00809"></a><span class="lineno">  809</span>&#160;    <span class="keywordflow">break</span>;</div><div class="line"><a name="l00810"></a><span class="lineno">  810</span>&#160;</div><div class="line"><a name="l00811"></a><span class="lineno">  811</span>&#160;    <span class="comment">// async task</span></div><div class="line"><a name="l00812"></a><span class="lineno">  812</span>&#160;    <span class="keywordflow">case</span> Node::ASYNC_TASK: {</div><div class="line"><a name="l00813"></a><span class="lineno">  813</span>&#160;      _invoke_async_task(worker, node);</div><div class="line"><a name="l00814"></a><span class="lineno">  814</span>&#160;      _decrement_topology_and_notify();</div><div class="line"><a name="l00815"></a><span class="lineno">  815</span>&#160;      return ;</div><div class="line"><a name="l00816"></a><span class="lineno">  816</span>&#160;    }</div><div class="line"><a name="l00817"></a><span class="lineno">  817</span>&#160;    <span class="keywordflow">break</span>;</div><div class="line"><a name="l00818"></a><span class="lineno">  818</span>&#160;</div><div class="line"><a name="l00819"></a><span class="lineno">  819</span>&#160;    <span class="comment">// cudaflow task</span></div><div class="line"><a name="l00820"></a><span class="lineno">  820</span>&#160;<span class="preprocessor">#ifdef TF_ENABLE_CUDA</span></div><div class="line"><a name="l00821"></a><span class="lineno">  821</span>&#160;    <span class="keywordflow">case</span> Node::CUDAFLOW_TASK: {</div><div class="line"><a name="l00822"></a><span class="lineno">  822</span>&#160;      _invoke_cudaflow_task(worker, node);</div><div class="line"><a name="l00823"></a><span class="lineno">  823</span>&#160;    }</div><div class="line"><a name="l00824"></a><span class="lineno">  824</span>&#160;    <span class="keywordflow">break</span>; </div><div class="line"><a name="l00825"></a><span class="lineno">  825</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00826"></a><span class="lineno">  826</span>&#160;</div><div class="line"><a name="l00827"></a><span class="lineno">  827</span>&#160;    <span class="comment">// monostate</span></div><div class="line"><a name="l00828"></a><span class="lineno">  828</span>&#160;    <span class="keywordflow">default</span>:</div><div class="line"><a name="l00829"></a><span class="lineno">  829</span>&#160;    <span class="keywordflow">break</span>;</div><div class="line"><a name="l00830"></a><span class="lineno">  830</span>&#160;  }</div><div class="line"><a name="l00831"></a><span class="lineno">  831</span>&#160;</div><div class="line"><a name="l00832"></a><span class="lineno">  832</span>&#160;  <span class="comment">// We MUST recover the dependency since the graph may have cycles.</span></div><div class="line"><a name="l00833"></a><span class="lineno">  833</span>&#160;  <span class="comment">// This must be done before scheduling the successors, otherwise this might cause </span></div><div class="line"><a name="l00834"></a><span class="lineno">  834</span>&#160;  <span class="comment">// race condition on the _dependents</span></div><div class="line"><a name="l00835"></a><span class="lineno">  835</span>&#160;  <span class="keywordflow">if</span>(node-&gt;_has_state(Node::BRANCHED)) {</div><div class="line"><a name="l00836"></a><span class="lineno">  836</span>&#160;    node-&gt;_join_counter = node-&gt;num_strong_dependents();</div><div class="line"><a name="l00837"></a><span class="lineno">  837</span>&#160;  }</div><div class="line"><a name="l00838"></a><span class="lineno">  838</span>&#160;  <span class="keywordflow">else</span> {</div><div class="line"><a name="l00839"></a><span class="lineno">  839</span>&#160;    node-&gt;_join_counter = node-&gt;num_dependents();</div><div class="line"><a name="l00840"></a><span class="lineno">  840</span>&#160;  }</div><div class="line"><a name="l00841"></a><span class="lineno">  841</span>&#160;  </div><div class="line"><a name="l00842"></a><span class="lineno">  842</span>&#160;  <span class="comment">// acquire the parent flow counter</span></div><div class="line"><a name="l00843"></a><span class="lineno">  843</span>&#160;  <span class="keyword">auto</span>&amp; c = (node-&gt;_parent) ? node-&gt;_parent-&gt;_join_counter : </div><div class="line"><a name="l00844"></a><span class="lineno">  844</span>&#160;                              node-&gt;_topology-&gt;_join_counter;</div><div class="line"><a name="l00845"></a><span class="lineno">  845</span>&#160;  </div><div class="line"><a name="l00846"></a><span class="lineno">  846</span>&#160;  <span class="comment">// At this point, the node storage might be destructed (to be verified)</span></div><div class="line"><a name="l00847"></a><span class="lineno">  847</span>&#160;  <span class="comment">// case 1: non-condition task</span></div><div class="line"><a name="l00848"></a><span class="lineno">  848</span>&#160;  <span class="keywordflow">if</span>(type != Node::CONDITION_TASK) {</div><div class="line"><a name="l00849"></a><span class="lineno">  849</span>&#160;    <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i=0; i&lt;num_successors; ++i) {</div><div class="line"><a name="l00850"></a><span class="lineno">  850</span>&#160;      <span class="keywordflow">if</span>(--(node-&gt;_successors[i]-&gt;_join_counter) == 0) {</div><div class="line"><a name="l00851"></a><span class="lineno">  851</span>&#160;        c.fetch_add(1);</div><div class="line"><a name="l00852"></a><span class="lineno">  852</span>&#160;        _schedule(node-&gt;_successors[i]);</div><div class="line"><a name="l00853"></a><span class="lineno">  853</span>&#160;      }</div><div class="line"><a name="l00854"></a><span class="lineno">  854</span>&#160;    }</div><div class="line"><a name="l00855"></a><span class="lineno">  855</span>&#160;  }</div><div class="line"><a name="l00856"></a><span class="lineno">  856</span>&#160;  <span class="comment">// case 2: condition task</span></div><div class="line"><a name="l00857"></a><span class="lineno">  857</span>&#160;  <span class="keywordflow">else</span> {</div><div class="line"><a name="l00858"></a><span class="lineno">  858</span>&#160;    <span class="keywordflow">if</span>(cond &gt;= 0 &amp;&amp; static_cast&lt;size_t&gt;(cond) &lt; num_successors) {</div><div class="line"><a name="l00859"></a><span class="lineno">  859</span>&#160;      <span class="keyword">auto</span> s = node-&gt;_successors[cond];</div><div class="line"><a name="l00860"></a><span class="lineno">  860</span>&#160;      s-&gt;_join_counter.store(0);  <span class="comment">// seems redundant but just for invariant</span></div><div class="line"><a name="l00861"></a><span class="lineno">  861</span>&#160;      c.fetch_add(1);</div><div class="line"><a name="l00862"></a><span class="lineno">  862</span>&#160;      _schedule(s);</div><div class="line"><a name="l00863"></a><span class="lineno">  863</span>&#160;    }</div><div class="line"><a name="l00864"></a><span class="lineno">  864</span>&#160;  }</div><div class="line"><a name="l00865"></a><span class="lineno">  865</span>&#160;</div><div class="line"><a name="l00866"></a><span class="lineno">  866</span>&#160;  <span class="comment">// tear down topology if the node is the last one</span></div><div class="line"><a name="l00867"></a><span class="lineno">  867</span>&#160;  <span class="keywordflow">if</span>(node-&gt;_parent == <span class="keyword">nullptr</span>) {</div><div class="line"><a name="l00868"></a><span class="lineno">  868</span>&#160;    <span class="keywordflow">if</span>(node-&gt;_topology-&gt;_join_counter.fetch_sub(1) == 1) {</div><div class="line"><a name="l00869"></a><span class="lineno">  869</span>&#160;      _tear_down_topology(node-&gt;_topology);</div><div class="line"><a name="l00870"></a><span class="lineno">  870</span>&#160;    }</div><div class="line"><a name="l00871"></a><span class="lineno">  871</span>&#160;  }</div><div class="line"><a name="l00872"></a><span class="lineno">  872</span>&#160;  <span class="keywordflow">else</span> {  <span class="comment">// joined subflow</span></div><div class="line"><a name="l00873"></a><span class="lineno">  873</span>&#160;    node-&gt;_parent-&gt;_join_counter.fetch_sub(1);</div><div class="line"><a name="l00874"></a><span class="lineno">  874</span>&#160;  }</div><div class="line"><a name="l00875"></a><span class="lineno">  875</span>&#160;}</div><div class="line"><a name="l00876"></a><span class="lineno">  876</span>&#160;</div><div class="line"><a name="l00877"></a><span class="lineno">  877</span>&#160;<span class="comment">// Procedure: _observer_prologue</span></div><div class="line"><a name="l00878"></a><span class="lineno">  878</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_observer_prologue(Worker&amp; worker, Node* node) {</div><div class="line"><a name="l00879"></a><span class="lineno">  879</span>&#160;  <span class="keywordflow">for</span>(<span class="keyword">auto</span>&amp; observer : _observers) {</div><div class="line"><a name="l00880"></a><span class="lineno">  880</span>&#160;    observer-&gt;on_entry(worker.id, TaskView(node));</div><div class="line"><a name="l00881"></a><span class="lineno">  881</span>&#160;  }</div><div class="line"><a name="l00882"></a><span class="lineno">  882</span>&#160;}</div><div class="line"><a name="l00883"></a><span class="lineno">  883</span>&#160;</div><div class="line"><a name="l00884"></a><span class="lineno">  884</span>&#160;<span class="comment">// Procedure: _observer_epilogue</span></div><div class="line"><a name="l00885"></a><span class="lineno">  885</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_observer_epilogue(Worker&amp; worker, Node* node) {</div><div class="line"><a name="l00886"></a><span class="lineno">  886</span>&#160;  <span class="keywordflow">for</span>(<span class="keyword">auto</span>&amp; observer : _observers) {</div><div class="line"><a name="l00887"></a><span class="lineno">  887</span>&#160;    observer-&gt;on_exit(worker.id, TaskView(node));</div><div class="line"><a name="l00888"></a><span class="lineno">  888</span>&#160;  }</div><div class="line"><a name="l00889"></a><span class="lineno">  889</span>&#160;}</div><div class="line"><a name="l00890"></a><span class="lineno">  890</span>&#160;</div><div class="line"><a name="l00891"></a><span class="lineno">  891</span>&#160;<span class="comment">// Procedure: _invoke_static_task</span></div><div class="line"><a name="l00892"></a><span class="lineno">  892</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_invoke_static_task(Worker&amp; worker, Node* node) {</div><div class="line"><a name="l00893"></a><span class="lineno">  893</span>&#160;  _observer_prologue(worker, node);</div><div class="line"><a name="l00894"></a><span class="lineno">  894</span>&#160;  std::get&lt;Node::StaticTask&gt;(node-&gt;_handle).work();</div><div class="line"><a name="l00895"></a><span class="lineno">  895</span>&#160;  _observer_epilogue(worker, node);</div><div class="line"><a name="l00896"></a><span class="lineno">  896</span>&#160;}</div><div class="line"><a name="l00897"></a><span class="lineno">  897</span>&#160;</div><div class="line"><a name="l00898"></a><span class="lineno">  898</span>&#160;<span class="comment">// Procedure: _invoke_dynamic_task</span></div><div class="line"><a name="l00899"></a><span class="lineno">  899</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_invoke_dynamic_task(Worker&amp; w, Node* node) {</div><div class="line"><a name="l00900"></a><span class="lineno">  900</span>&#160;</div><div class="line"><a name="l00901"></a><span class="lineno">  901</span>&#160;  _observer_prologue(w, node);</div><div class="line"><a name="l00902"></a><span class="lineno">  902</span>&#160;</div><div class="line"><a name="l00903"></a><span class="lineno">  903</span>&#160;  <span class="keyword">auto</span>&amp; handle = std::get&lt;Node::DynamicTask&gt;(node-&gt;_handle);</div><div class="line"><a name="l00904"></a><span class="lineno">  904</span>&#160;</div><div class="line"><a name="l00905"></a><span class="lineno">  905</span>&#160;  handle.subgraph.clear();</div><div class="line"><a name="l00906"></a><span class="lineno">  906</span>&#160;</div><div class="line"><a name="l00907"></a><span class="lineno">  907</span>&#160;  Subflow sf(*<span class="keyword">this</span>, node, handle.subgraph); </div><div class="line"><a name="l00908"></a><span class="lineno">  908</span>&#160;</div><div class="line"><a name="l00909"></a><span class="lineno">  909</span>&#160;  handle.work(sf);</div><div class="line"><a name="l00910"></a><span class="lineno">  910</span>&#160;</div><div class="line"><a name="l00911"></a><span class="lineno">  911</span>&#160;  <span class="keywordflow">if</span>(sf._joinable) {</div><div class="line"><a name="l00912"></a><span class="lineno">  912</span>&#160;    _invoke_dynamic_task_internal(w, node, handle.subgraph, <span class="keyword">false</span>);</div><div class="line"><a name="l00913"></a><span class="lineno">  913</span>&#160;  }</div><div class="line"><a name="l00914"></a><span class="lineno">  914</span>&#160;  </div><div class="line"><a name="l00915"></a><span class="lineno">  915</span>&#160;  _observer_epilogue(w, node);</div><div class="line"><a name="l00916"></a><span class="lineno">  916</span>&#160;}</div><div class="line"><a name="l00917"></a><span class="lineno">  917</span>&#160;</div><div class="line"><a name="l00918"></a><span class="lineno">  918</span>&#160;<span class="comment">// Procedure: _invoke_dynamic_task_external</span></div><div class="line"><a name="l00919"></a><span class="lineno">  919</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_invoke_dynamic_task_external(Node*p, Graph&amp; g, <span class="keywordtype">bool</span> detach) {</div><div class="line"><a name="l00920"></a><span class="lineno">  920</span>&#160;</div><div class="line"><a name="l00921"></a><span class="lineno">  921</span>&#160;  <span class="keyword">auto</span> worker = _per_thread().worker;</div><div class="line"><a name="l00922"></a><span class="lineno">  922</span>&#160;</div><div class="line"><a name="l00923"></a><span class="lineno">  923</span>&#160;  assert(worker &amp;&amp; worker-&gt;executor == <span class="keyword">this</span>);</div><div class="line"><a name="l00924"></a><span class="lineno">  924</span>&#160;  </div><div class="line"><a name="l00925"></a><span class="lineno">  925</span>&#160;  _invoke_dynamic_task_internal(*worker, p, g, detach);</div><div class="line"><a name="l00926"></a><span class="lineno">  926</span>&#160;}</div><div class="line"><a name="l00927"></a><span class="lineno">  927</span>&#160;</div><div class="line"><a name="l00928"></a><span class="lineno">  928</span>&#160;<span class="comment">// Procedure: _invoke_dynamic_task_internal</span></div><div class="line"><a name="l00929"></a><span class="lineno">  929</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_invoke_dynamic_task_internal(</div><div class="line"><a name="l00930"></a><span class="lineno">  930</span>&#160;  Worker&amp; w, Node* p, Graph&amp; g, <span class="keywordtype">bool</span> detach</div><div class="line"><a name="l00931"></a><span class="lineno">  931</span>&#160;) {</div><div class="line"><a name="l00932"></a><span class="lineno">  932</span>&#160;</div><div class="line"><a name="l00933"></a><span class="lineno">  933</span>&#160;  assert(p);</div><div class="line"><a name="l00934"></a><span class="lineno">  934</span>&#160;</div><div class="line"><a name="l00935"></a><span class="lineno">  935</span>&#160;  <span class="keywordflow">if</span>(g.empty()) <span class="keywordflow">return</span>;</div><div class="line"><a name="l00936"></a><span class="lineno">  936</span>&#160;</div><div class="line"><a name="l00937"></a><span class="lineno">  937</span>&#160;  <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;Node*&gt;</a> src; </div><div class="line"><a name="l00938"></a><span class="lineno">  938</span>&#160;</div><div class="line"><a name="l00939"></a><span class="lineno">  939</span>&#160;  <span class="keywordflow">for</span>(<span class="keyword">auto</span> n : g._nodes) {</div><div class="line"><a name="l00940"></a><span class="lineno">  940</span>&#160;</div><div class="line"><a name="l00941"></a><span class="lineno">  941</span>&#160;    n-&gt;_topology = p-&gt;_topology;</div><div class="line"><a name="l00942"></a><span class="lineno">  942</span>&#160;    n-&gt;_set_up_join_counter();</div><div class="line"><a name="l00943"></a><span class="lineno">  943</span>&#160;</div><div class="line"><a name="l00944"></a><span class="lineno">  944</span>&#160;    <span class="keywordflow">if</span>(detach) {</div><div class="line"><a name="l00945"></a><span class="lineno">  945</span>&#160;      n-&gt;_parent = <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00946"></a><span class="lineno">  946</span>&#160;      n-&gt;_set_state(Node::DETACHED);</div><div class="line"><a name="l00947"></a><span class="lineno">  947</span>&#160;    }</div><div class="line"><a name="l00948"></a><span class="lineno">  948</span>&#160;    <span class="keywordflow">else</span> {</div><div class="line"><a name="l00949"></a><span class="lineno">  949</span>&#160;      n-&gt;_parent = p;</div><div class="line"><a name="l00950"></a><span class="lineno">  950</span>&#160;    }</div><div class="line"><a name="l00951"></a><span class="lineno">  951</span>&#160;    </div><div class="line"><a name="l00952"></a><span class="lineno">  952</span>&#160;    <span class="keywordflow">if</span>(n-&gt;num_dependents() == 0) {</div><div class="line"><a name="l00953"></a><span class="lineno">  953</span>&#160;      src.push_back(n);</div><div class="line"><a name="l00954"></a><span class="lineno">  954</span>&#160;    }</div><div class="line"><a name="l00955"></a><span class="lineno">  955</span>&#160;  }</div><div class="line"><a name="l00956"></a><span class="lineno">  956</span>&#160;  </div><div class="line"><a name="l00957"></a><span class="lineno">  957</span>&#160;  <span class="comment">// detach here</span></div><div class="line"><a name="l00958"></a><span class="lineno">  958</span>&#160;  <span class="keywordflow">if</span>(detach) {    </div><div class="line"><a name="l00959"></a><span class="lineno">  959</span>&#160;    </div><div class="line"><a name="l00960"></a><span class="lineno">  960</span>&#160;    {</div><div class="line"><a name="l00961"></a><span class="lineno">  961</span>&#160;      <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/lock_guard.html">std::lock_guard&lt;std::mutex&gt;</a> <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/lock.html">lock</a>(p-&gt;_topology-&gt;_taskflow._mtx);</div><div class="line"><a name="l00962"></a><span class="lineno">  962</span>&#160;      p-&gt;_topology-&gt;_taskflow._graph.merge(std::move(g));</div><div class="line"><a name="l00963"></a><span class="lineno">  963</span>&#160;    }</div><div class="line"><a name="l00964"></a><span class="lineno">  964</span>&#160;</div><div class="line"><a name="l00965"></a><span class="lineno">  965</span>&#160;    p-&gt;_topology-&gt;_join_counter.fetch_add(src.size());</div><div class="line"><a name="l00966"></a><span class="lineno">  966</span>&#160;    _schedule(src);</div><div class="line"><a name="l00967"></a><span class="lineno">  967</span>&#160;  }</div><div class="line"><a name="l00968"></a><span class="lineno">  968</span>&#160;  <span class="comment">// join here</span></div><div class="line"><a name="l00969"></a><span class="lineno">  969</span>&#160;  <span class="keywordflow">else</span> {  </div><div class="line"><a name="l00970"></a><span class="lineno">  970</span>&#160;    p-&gt;_join_counter.fetch_add(src.size());</div><div class="line"><a name="l00971"></a><span class="lineno">  971</span>&#160;    _schedule(src);</div><div class="line"><a name="l00972"></a><span class="lineno">  972</span>&#160;    Node* t = <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00973"></a><span class="lineno">  973</span>&#160;  </div><div class="line"><a name="l00974"></a><span class="lineno">  974</span>&#160;    <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/numeric/random/uniform_int_distribution.html">std::uniform_int_distribution&lt;size_t&gt;</a> rdvtm(_VICTIM_BEG, _VICTIM_END);</div><div class="line"><a name="l00975"></a><span class="lineno">  975</span>&#160;</div><div class="line"><a name="l00976"></a><span class="lineno">  976</span>&#160;    <span class="keywordflow">while</span>(p-&gt;_join_counter != 0) {</div><div class="line"><a name="l00977"></a><span class="lineno">  977</span>&#160;</div><div class="line"><a name="l00978"></a><span class="lineno">  978</span>&#160;      t = w.wsq[w.domain].pop();</div><div class="line"><a name="l00979"></a><span class="lineno">  979</span>&#160;</div><div class="line"><a name="l00980"></a><span class="lineno">  980</span>&#160;      exploit:</div><div class="line"><a name="l00981"></a><span class="lineno">  981</span>&#160;</div><div class="line"><a name="l00982"></a><span class="lineno">  982</span>&#160;      <span class="keywordflow">if</span>(t) {</div><div class="line"><a name="l00983"></a><span class="lineno">  983</span>&#160;        _invoke(w, t);</div><div class="line"><a name="l00984"></a><span class="lineno">  984</span>&#160;        <span class="comment">//if(t-&gt;_parent == nullptr) {</span></div><div class="line"><a name="l00985"></a><span class="lineno">  985</span>&#160;        <span class="comment">//  if(t-&gt;_topology-&gt;_join_counter.fetch_sub(1) == 1) {</span></div><div class="line"><a name="l00986"></a><span class="lineno">  986</span>&#160;        <span class="comment">//    _tear_down_topology(t-&gt;_topology);</span></div><div class="line"><a name="l00987"></a><span class="lineno">  987</span>&#160;        <span class="comment">//  }</span></div><div class="line"><a name="l00988"></a><span class="lineno">  988</span>&#160;        <span class="comment">//}</span></div><div class="line"><a name="l00989"></a><span class="lineno">  989</span>&#160;        <span class="comment">//else {  // joined subflow</span></div><div class="line"><a name="l00990"></a><span class="lineno">  990</span>&#160;        <span class="comment">//  t-&gt;_parent-&gt;_join_counter.fetch_sub(1);</span></div><div class="line"><a name="l00991"></a><span class="lineno">  991</span>&#160;        <span class="comment">//}</span></div><div class="line"><a name="l00992"></a><span class="lineno">  992</span>&#160;      }</div><div class="line"><a name="l00993"></a><span class="lineno">  993</span>&#160;      <span class="keywordflow">else</span> {</div><div class="line"><a name="l00994"></a><span class="lineno">  994</span>&#160;</div><div class="line"><a name="l00995"></a><span class="lineno">  995</span>&#160;        explore:</div><div class="line"><a name="l00996"></a><span class="lineno">  996</span>&#160;        t = (w.id == w.vtm) ? _wsq[w.domain].steal() : </div><div class="line"><a name="l00997"></a><span class="lineno">  997</span>&#160;                              _workers[w.vtm].wsq[w.domain].steal();</div><div class="line"><a name="l00998"></a><span class="lineno">  998</span>&#160;        <span class="keywordflow">if</span>(t) {</div><div class="line"><a name="l00999"></a><span class="lineno">  999</span>&#160;          <span class="keywordflow">goto</span> exploit;</div><div class="line"><a name="l01000"></a><span class="lineno"> 1000</span>&#160;        }</div><div class="line"><a name="l01001"></a><span class="lineno"> 1001</span>&#160;        <span class="keywordflow">else</span> <span class="keywordflow">if</span>(p-&gt;_join_counter != 0){</div><div class="line"><a name="l01002"></a><span class="lineno"> 1002</span>&#160;          <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/yield.html">std::this_thread::yield</a>();</div><div class="line"><a name="l01003"></a><span class="lineno"> 1003</span>&#160;          w.vtm = rdvtm(w.rdgen);</div><div class="line"><a name="l01004"></a><span class="lineno"> 1004</span>&#160;          <span class="keywordflow">goto</span> explore;</div><div class="line"><a name="l01005"></a><span class="lineno"> 1005</span>&#160;        }</div><div class="line"><a name="l01006"></a><span class="lineno"> 1006</span>&#160;        <span class="keywordflow">else</span> {</div><div class="line"><a name="l01007"></a><span class="lineno"> 1007</span>&#160;          <span class="keywordflow">break</span>;</div><div class="line"><a name="l01008"></a><span class="lineno"> 1008</span>&#160;        }</div><div class="line"><a name="l01009"></a><span class="lineno"> 1009</span>&#160;      }</div><div class="line"><a name="l01010"></a><span class="lineno"> 1010</span>&#160;    }</div><div class="line"><a name="l01011"></a><span class="lineno"> 1011</span>&#160;  }</div><div class="line"><a name="l01012"></a><span class="lineno"> 1012</span>&#160;}</div><div class="line"><a name="l01013"></a><span class="lineno"> 1013</span>&#160;</div><div class="line"><a name="l01014"></a><span class="lineno"> 1014</span>&#160;<span class="comment">// Procedure: _invoke_condition_task</span></div><div class="line"><a name="l01015"></a><span class="lineno"> 1015</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_invoke_condition_task(Worker&amp; worker, Node* node, <span class="keywordtype">int</span>&amp; cond) {</div><div class="line"><a name="l01016"></a><span class="lineno"> 1016</span>&#160;</div><div class="line"><a name="l01017"></a><span class="lineno"> 1017</span>&#160;  _observer_prologue(worker, node);</div><div class="line"><a name="l01018"></a><span class="lineno"> 1018</span>&#160;  </div><div class="line"><a name="l01019"></a><span class="lineno"> 1019</span>&#160;  cond = std::get&lt;Node::ConditionTask&gt;(node-&gt;_handle).work();</div><div class="line"><a name="l01020"></a><span class="lineno"> 1020</span>&#160;</div><div class="line"><a name="l01021"></a><span class="lineno"> 1021</span>&#160;  _observer_epilogue(worker, node);</div><div class="line"><a name="l01022"></a><span class="lineno"> 1022</span>&#160;}</div><div class="line"><a name="l01023"></a><span class="lineno"> 1023</span>&#160;</div><div class="line"><a name="l01024"></a><span class="lineno"> 1024</span>&#160;<span class="preprocessor">#ifdef TF_ENABLE_CUDA</span></div><div class="line"><a name="l01025"></a><span class="lineno"> 1025</span>&#160;<span class="comment">// Procedure: _invoke_cudaflow_task</span></div><div class="line"><a name="l01026"></a><span class="lineno"> 1026</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_invoke_cudaflow_task(Worker&amp; worker, Node* node) {</div><div class="line"><a name="l01027"></a><span class="lineno"> 1027</span>&#160;  _observer_prologue(worker, node);  </div><div class="line"><a name="l01028"></a><span class="lineno"> 1028</span>&#160;  assert(worker.domain == node-&gt;domain());</div><div class="line"><a name="l01029"></a><span class="lineno"> 1029</span>&#160;  std::get&lt;Node::cudaFlowTask&gt;(node-&gt;_handle).work(*<span class="keyword">this</span>, node);</div><div class="line"><a name="l01030"></a><span class="lineno"> 1030</span>&#160;  _observer_epilogue(worker, node);</div><div class="line"><a name="l01031"></a><span class="lineno"> 1031</span>&#160;}</div><div class="line"><a name="l01032"></a><span class="lineno"> 1032</span>&#160;</div><div class="line"><a name="l01033"></a><span class="lineno"> 1033</span>&#160;<span class="comment">// Procedure: _invoke_cudaflow_task_entry</span></div><div class="line"><a name="l01034"></a><span class="lineno"> 1034</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> C,</div><div class="line"><a name="l01035"></a><span class="lineno"> 1035</span>&#160;  std::enable_if_t&lt;std::is_invocable_r_v&lt;void, C, cudaFlow&amp;&gt;, <span class="keywordtype">void</span>&gt;*</div><div class="line"><a name="l01036"></a><span class="lineno"> 1036</span>&#160;&gt;</div><div class="line"><a name="l01037"></a><span class="lineno"> 1037</span>&#160;<span class="keywordtype">void</span> Executor::_invoke_cudaflow_task_entry(C&amp;&amp; c, Node* node) {</div><div class="line"><a name="l01038"></a><span class="lineno"> 1038</span>&#160;</div><div class="line"><a name="l01039"></a><span class="lineno"> 1039</span>&#160;  <span class="keyword">auto</span>&amp; h = std::get&lt;Node::cudaFlowTask&gt;(node-&gt;_handle);</div><div class="line"><a name="l01040"></a><span class="lineno"> 1040</span>&#160;  </div><div class="line"><a name="l01041"></a><span class="lineno"> 1041</span>&#160;  h.graph.clear();</div><div class="line"><a name="l01042"></a><span class="lineno"> 1042</span>&#160;</div><div class="line"><a name="l01043"></a><span class="lineno"> 1043</span>&#160;  h.graph._create_native_graph();</div><div class="line"><a name="l01044"></a><span class="lineno"> 1044</span>&#160;  </div><div class="line"><a name="l01045"></a><span class="lineno"> 1045</span>&#160;  cudaFlow cf(*<span class="keyword">this</span>, h.graph);</div><div class="line"><a name="l01046"></a><span class="lineno"> 1046</span>&#160;</div><div class="line"><a name="l01047"></a><span class="lineno"> 1047</span>&#160;  c(cf); </div><div class="line"><a name="l01048"></a><span class="lineno"> 1048</span>&#160;</div><div class="line"><a name="l01049"></a><span class="lineno"> 1049</span>&#160;  <span class="comment">// join the cudaflow</span></div><div class="line"><a name="l01050"></a><span class="lineno"> 1050</span>&#160;  <span class="keywordflow">if</span>(cf._joinable) {</div><div class="line"><a name="l01051"></a><span class="lineno"> 1051</span>&#160;    _invoke_cudaflow_task_external(</div><div class="line"><a name="l01052"></a><span class="lineno"> 1052</span>&#160;      cf, [repeat=1] () <span class="keyword">mutable</span> { <span class="keywordflow">return</span> repeat-- == 0; }, true</div><div class="line"><a name="l01053"></a><span class="lineno"> 1053</span>&#160;    );  </div><div class="line"><a name="l01054"></a><span class="lineno"> 1054</span>&#160;    cf._joinable = <span class="keyword">false</span>;</div><div class="line"><a name="l01055"></a><span class="lineno"> 1055</span>&#160;  }</div><div class="line"><a name="l01056"></a><span class="lineno"> 1056</span>&#160;</div><div class="line"><a name="l01057"></a><span class="lineno"> 1057</span>&#160;  <span class="comment">//h.graph.dump(std::cout, node);</span></div><div class="line"><a name="l01058"></a><span class="lineno"> 1058</span>&#160;    </div><div class="line"><a name="l01059"></a><span class="lineno"> 1059</span>&#160;  h.graph._destroy_native_graph();</div><div class="line"><a name="l01060"></a><span class="lineno"> 1060</span>&#160;}</div><div class="line"><a name="l01061"></a><span class="lineno"> 1061</span>&#160;</div><div class="line"><a name="l01062"></a><span class="lineno"> 1062</span>&#160;<span class="comment">// Procedure: _invoke_cudaflow_task_entry</span></div><div class="line"><a name="l01063"></a><span class="lineno"> 1063</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> C, </div><div class="line"><a name="l01064"></a><span class="lineno"> 1064</span>&#160;  std::enable_if_t&lt;std::is_invocable_r_v&lt;void, C, cudaFlowCapturer&amp;&gt;, <span class="keywordtype">void</span>&gt;*</div><div class="line"><a name="l01065"></a><span class="lineno"> 1065</span>&#160;&gt;</div><div class="line"><a name="l01066"></a><span class="lineno"> 1066</span>&#160;<span class="keywordtype">void</span> Executor::_invoke_cudaflow_task_entry(C&amp;&amp; c, Node* node) {</div><div class="line"><a name="l01067"></a><span class="lineno"> 1067</span>&#160;</div><div class="line"><a name="l01068"></a><span class="lineno"> 1068</span>&#160;  <span class="keyword">auto</span>&amp; h = std::get&lt;Node::cudaFlowTask&gt;(node-&gt;_handle);</div><div class="line"><a name="l01069"></a><span class="lineno"> 1069</span>&#160;  </div><div class="line"><a name="l01070"></a><span class="lineno"> 1070</span>&#160;  h.graph.clear();</div><div class="line"><a name="l01071"></a><span class="lineno"> 1071</span>&#160;  </div><div class="line"><a name="l01072"></a><span class="lineno"> 1072</span>&#160;  cudaFlowCapturer fc(h.graph);</div><div class="line"><a name="l01073"></a><span class="lineno"> 1073</span>&#160;</div><div class="line"><a name="l01074"></a><span class="lineno"> 1074</span>&#160;  c(fc);</div><div class="line"><a name="l01075"></a><span class="lineno"> 1075</span>&#160;  </div><div class="line"><a name="l01076"></a><span class="lineno"> 1076</span>&#160;  <span class="keyword">auto</span> captured = fc._capture();</div><div class="line"><a name="l01077"></a><span class="lineno"> 1077</span>&#160;  </div><div class="line"><a name="l01078"></a><span class="lineno"> 1078</span>&#160;  TF_CHECK_CUDA(</div><div class="line"><a name="l01079"></a><span class="lineno"> 1079</span>&#160;    cudaGraphInstantiate(</div><div class="line"><a name="l01080"></a><span class="lineno"> 1080</span>&#160;      &amp;fc._executable, captured, <span class="keyword">nullptr</span>, <span class="keyword">nullptr</span>, 0</div><div class="line"><a name="l01081"></a><span class="lineno"> 1081</span>&#160;    ),</div><div class="line"><a name="l01082"></a><span class="lineno"> 1082</span>&#160;    <span class="stringliteral">&quot;failed to create an executable graph&quot;</span></div><div class="line"><a name="l01083"></a><span class="lineno"> 1083</span>&#160;  );</div><div class="line"><a name="l01084"></a><span class="lineno"> 1084</span>&#160;  </div><div class="line"><a name="l01085"></a><span class="lineno"> 1085</span>&#160;  cudaScopedPerThreadStream s;</div><div class="line"><a name="l01086"></a><span class="lineno"> 1086</span>&#160;</div><div class="line"><a name="l01087"></a><span class="lineno"> 1087</span>&#160;  TF_CHECK_CUDA(cudaGraphLaunch(fc._executable, s), <span class="stringliteral">&quot;failed to exec&quot;</span>);</div><div class="line"><a name="l01088"></a><span class="lineno"> 1088</span>&#160;  TF_CHECK_CUDA(cudaStreamSynchronize(s), <span class="stringliteral">&quot;failed to synchronize stream&quot;</span>);</div><div class="line"><a name="l01089"></a><span class="lineno"> 1089</span>&#160;  TF_CHECK_CUDA(cudaGraphExecDestroy(fc._executable), <span class="stringliteral">&quot;failed to destroy exec&quot;</span>);</div><div class="line"><a name="l01090"></a><span class="lineno"> 1090</span>&#160;</div><div class="line"><a name="l01091"></a><span class="lineno"> 1091</span>&#160;  fc._executable = <span class="keyword">nullptr</span>;</div><div class="line"><a name="l01092"></a><span class="lineno"> 1092</span>&#160;  </div><div class="line"><a name="l01093"></a><span class="lineno"> 1093</span>&#160;  TF_CHECK_CUDA(cudaGraphDestroy(captured), <span class="stringliteral">&quot;failed to destroy captured graph&quot;</span>);</div><div class="line"><a name="l01094"></a><span class="lineno"> 1094</span>&#160;</div><div class="line"><a name="l01095"></a><span class="lineno"> 1095</span>&#160;  <span class="comment">// TODO: how do we support the update?</span></div><div class="line"><a name="l01096"></a><span class="lineno"> 1096</span>&#160;}</div><div class="line"><a name="l01097"></a><span class="lineno"> 1097</span>&#160;</div><div class="line"><a name="l01098"></a><span class="lineno"> 1098</span>&#160;<span class="comment">// Procedure: _invoke_cudaflow_task_internal</span></div><div class="line"><a name="l01099"></a><span class="lineno"> 1099</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> P&gt;</div><div class="line"><a name="l01100"></a><span class="lineno"> 1100</span>&#160;<span class="keywordtype">void</span> Executor::_invoke_cudaflow_task_internal(</div><div class="line"><a name="l01101"></a><span class="lineno"> 1101</span>&#160;  Worker&amp;, cudaFlow&amp; cf, P&amp;&amp; predicate, <span class="keywordtype">bool</span> join</div><div class="line"><a name="l01102"></a><span class="lineno"> 1102</span>&#160;) {</div><div class="line"><a name="l01103"></a><span class="lineno"> 1103</span>&#160;  </div><div class="line"><a name="l01104"></a><span class="lineno"> 1104</span>&#160;  <span class="keywordflow">if</span>(cf.empty()) {</div><div class="line"><a name="l01105"></a><span class="lineno"> 1105</span>&#160;    <span class="keywordflow">return</span>;</div><div class="line"><a name="l01106"></a><span class="lineno"> 1106</span>&#160;  }</div><div class="line"><a name="l01107"></a><span class="lineno"> 1107</span>&#160;  </div><div class="line"><a name="l01108"></a><span class="lineno"> 1108</span>&#160;  <span class="comment">// transforms cudaFlow to a native cudaGraph under the specified device</span></div><div class="line"><a name="l01109"></a><span class="lineno"> 1109</span>&#160;  <span class="comment">// and launches the graph through a given or an internal device stream</span></div><div class="line"><a name="l01110"></a><span class="lineno"> 1110</span>&#160;  <span class="keywordflow">if</span>(cf._executable == <span class="keyword">nullptr</span>) {</div><div class="line"><a name="l01111"></a><span class="lineno"> 1111</span>&#160;    cf._create_executable();</div><div class="line"><a name="l01112"></a><span class="lineno"> 1112</span>&#160;    <span class="comment">//cuda_dump_graph(std::cout, cf._graph._native_handle);</span></div><div class="line"><a name="l01113"></a><span class="lineno"> 1113</span>&#160;  }</div><div class="line"><a name="l01114"></a><span class="lineno"> 1114</span>&#160;</div><div class="line"><a name="l01115"></a><span class="lineno"> 1115</span>&#160;  cudaScopedPerThreadStream s;</div><div class="line"><a name="l01116"></a><span class="lineno"> 1116</span>&#160;</div><div class="line"><a name="l01117"></a><span class="lineno"> 1117</span>&#160;  <span class="keywordflow">while</span>(!predicate()) {</div><div class="line"><a name="l01118"></a><span class="lineno"> 1118</span>&#160;</div><div class="line"><a name="l01119"></a><span class="lineno"> 1119</span>&#160;    TF_CHECK_CUDA(</div><div class="line"><a name="l01120"></a><span class="lineno"> 1120</span>&#160;      cudaGraphLaunch(cf._executable, s), <span class="stringliteral">&quot;failed to execute cudaFlow&quot;</span></div><div class="line"><a name="l01121"></a><span class="lineno"> 1121</span>&#160;    );</div><div class="line"><a name="l01122"></a><span class="lineno"> 1122</span>&#160;</div><div class="line"><a name="l01123"></a><span class="lineno"> 1123</span>&#160;    TF_CHECK_CUDA(</div><div class="line"><a name="l01124"></a><span class="lineno"> 1124</span>&#160;      cudaStreamSynchronize(s), <span class="stringliteral">&quot;failed to synchronize cudaFlow execution&quot;</span></div><div class="line"><a name="l01125"></a><span class="lineno"> 1125</span>&#160;    );</div><div class="line"><a name="l01126"></a><span class="lineno"> 1126</span>&#160;  }</div><div class="line"><a name="l01127"></a><span class="lineno"> 1127</span>&#160;</div><div class="line"><a name="l01128"></a><span class="lineno"> 1128</span>&#160;  <span class="keywordflow">if</span>(join) {</div><div class="line"><a name="l01129"></a><span class="lineno"> 1129</span>&#160;    <span class="comment">//cuda_dump_graph(std::cout, cf._graph._native_handle);</span></div><div class="line"><a name="l01130"></a><span class="lineno"> 1130</span>&#160;    cf._destroy_executable();</div><div class="line"><a name="l01131"></a><span class="lineno"> 1131</span>&#160;  }</div><div class="line"><a name="l01132"></a><span class="lineno"> 1132</span>&#160;}</div><div class="line"><a name="l01133"></a><span class="lineno"> 1133</span>&#160;</div><div class="line"><a name="l01134"></a><span class="lineno"> 1134</span>&#160;<span class="comment">// Procedure: _invoke_cudaflow_task_external</span></div><div class="line"><a name="l01135"></a><span class="lineno"> 1135</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> P&gt;</div><div class="line"><a name="l01136"></a><span class="lineno"> 1136</span>&#160;<span class="keywordtype">void</span> Executor::_invoke_cudaflow_task_external(</div><div class="line"><a name="l01137"></a><span class="lineno"> 1137</span>&#160;  cudaFlow&amp; cf, P&amp;&amp; predicate, <span class="keywordtype">bool</span> join</div><div class="line"><a name="l01138"></a><span class="lineno"> 1138</span>&#160;) {</div><div class="line"><a name="l01139"></a><span class="lineno"> 1139</span>&#160;</div><div class="line"><a name="l01140"></a><span class="lineno"> 1140</span>&#160;  <span class="keyword">auto</span> w = _per_thread().worker;</div><div class="line"><a name="l01141"></a><span class="lineno"> 1141</span>&#160;  </div><div class="line"><a name="l01142"></a><span class="lineno"> 1142</span>&#160;  assert(w &amp;&amp; w-&gt;executor == <span class="keyword">this</span>);</div><div class="line"><a name="l01143"></a><span class="lineno"> 1143</span>&#160;</div><div class="line"><a name="l01144"></a><span class="lineno"> 1144</span>&#160;  _invoke_cudaflow_task_internal(*w, cf, std::forward&lt;P&gt;(predicate), join);</div><div class="line"><a name="l01145"></a><span class="lineno"> 1145</span>&#160;}</div><div class="line"><a name="l01146"></a><span class="lineno"> 1146</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l01147"></a><span class="lineno"> 1147</span>&#160;</div><div class="line"><a name="l01148"></a><span class="lineno"> 1148</span>&#160;<span class="comment">// Procedure: _invoke_module_task</span></div><div class="line"><a name="l01149"></a><span class="lineno"> 1149</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_invoke_module_task(Worker&amp; w, Node* node) {</div><div class="line"><a name="l01150"></a><span class="lineno"> 1150</span>&#160;</div><div class="line"><a name="l01151"></a><span class="lineno"> 1151</span>&#160;  _observer_prologue(w, node);</div><div class="line"><a name="l01152"></a><span class="lineno"> 1152</span>&#160;  </div><div class="line"><a name="l01153"></a><span class="lineno"> 1153</span>&#160;  <span class="keyword">auto</span> module = std::get&lt;Node::ModuleTask&gt;(node-&gt;_handle).module;</div><div class="line"><a name="l01154"></a><span class="lineno"> 1154</span>&#160;  </div><div class="line"><a name="l01155"></a><span class="lineno"> 1155</span>&#160;  _invoke_dynamic_task_internal(w, node, module-&gt;_graph, <span class="keyword">false</span>);</div><div class="line"><a name="l01156"></a><span class="lineno"> 1156</span>&#160;  </div><div class="line"><a name="l01157"></a><span class="lineno"> 1157</span>&#160;  _observer_epilogue(w, node);  </div><div class="line"><a name="l01158"></a><span class="lineno"> 1158</span>&#160;}</div><div class="line"><a name="l01159"></a><span class="lineno"> 1159</span>&#160;</div><div class="line"><a name="l01160"></a><span class="lineno"> 1160</span>&#160;<span class="comment">// Procedure: _invoke_async_task</span></div><div class="line"><a name="l01161"></a><span class="lineno"> 1161</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_invoke_async_task(Worker&amp; w, Node* node) {</div><div class="line"><a name="l01162"></a><span class="lineno"> 1162</span>&#160;  _observer_prologue(w, node);</div><div class="line"><a name="l01163"></a><span class="lineno"> 1163</span>&#160;  </div><div class="line"><a name="l01164"></a><span class="lineno"> 1164</span>&#160;  std::get&lt;Node::AsyncTask&gt;(node-&gt;_handle).work();</div><div class="line"><a name="l01165"></a><span class="lineno"> 1165</span>&#160;</div><div class="line"><a name="l01166"></a><span class="lineno"> 1166</span>&#160;  _observer_epilogue(w, node);  </div><div class="line"><a name="l01167"></a><span class="lineno"> 1167</span>&#160;  </div><div class="line"><a name="l01168"></a><span class="lineno"> 1168</span>&#160;  <span class="comment">// recycle the node</span></div><div class="line"><a name="l01169"></a><span class="lineno"> 1169</span>&#160;  node_pool.recycle(node);</div><div class="line"><a name="l01170"></a><span class="lineno"> 1170</span>&#160;}</div><div class="line"><a name="l01171"></a><span class="lineno"> 1171</span>&#160;</div><div class="line"><a name="l01172"></a><span class="lineno"> 1172</span>&#160;<span class="comment">// Function: run</span></div><div class="line"><a name="l01173"></a><span class="lineno"><a class="line" href="classtf_1_1Executor.html#a81f35d5b0a20ac0646447eb80d97c0aa"> 1173</a></span>&#160;<span class="keyword">inline</span> <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/future.html">std::future&lt;void&gt;</a> <a class="code" href="classtf_1_1Executor.html#a81f35d5b0a20ac0646447eb80d97c0aa">Executor::run</a>(<a class="code" href="classtf_1_1Taskflow.html">Taskflow</a>&amp; f) {</div><div class="line"><a name="l01174"></a><span class="lineno"> 1174</span>&#160;  <span class="keywordflow">return</span> <a class="code" href="classtf_1_1Executor.html#adca6cd0ce1bd7e6fa2ed2a55c9ae15e6">run_n</a>(f, 1, [](){});</div><div class="line"><a name="l01175"></a><span class="lineno"> 1175</span>&#160;}</div><div class="line"><a name="l01176"></a><span class="lineno"> 1176</span>&#160;</div><div class="line"><a name="l01177"></a><span class="lineno"> 1177</span>&#160;<span class="comment">// Function: run</span></div><div class="line"><a name="l01178"></a><span class="lineno"> 1178</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> C&gt;</div><div class="line"><a name="l01179"></a><span class="lineno"><a class="line" href="classtf_1_1Executor.html#a94b45b69dc247c82c2ada8c90424b172"> 1179</a></span>&#160;<a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/future.html">std::future&lt;void&gt;</a> <a class="code" href="classtf_1_1Executor.html#a81f35d5b0a20ac0646447eb80d97c0aa">Executor::run</a>(<a class="code" href="classtf_1_1Taskflow.html">Taskflow</a>&amp; f, C&amp;&amp; c) {</div><div class="line"><a name="l01180"></a><span class="lineno"> 1180</span>&#160;  <span class="keywordflow">return</span> <a class="code" href="classtf_1_1Executor.html#adca6cd0ce1bd7e6fa2ed2a55c9ae15e6">run_n</a>(f, 1, std::forward&lt;C&gt;(c));</div><div class="line"><a name="l01181"></a><span class="lineno"> 1181</span>&#160;}</div><div class="line"><a name="l01182"></a><span class="lineno"> 1182</span>&#160;</div><div class="line"><a name="l01183"></a><span class="lineno"> 1183</span>&#160;<span class="comment">// Function: run_n</span></div><div class="line"><a name="l01184"></a><span class="lineno"><a class="line" href="classtf_1_1Executor.html#adca6cd0ce1bd7e6fa2ed2a55c9ae15e6"> 1184</a></span>&#160;<span class="keyword">inline</span> <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/future.html">std::future&lt;void&gt;</a> <a class="code" href="classtf_1_1Executor.html#adca6cd0ce1bd7e6fa2ed2a55c9ae15e6">Executor::run_n</a>(<a class="code" href="classtf_1_1Taskflow.html">Taskflow</a>&amp; f, <span class="keywordtype">size_t</span> repeat) {</div><div class="line"><a name="l01185"></a><span class="lineno"> 1185</span>&#160;  <span class="keywordflow">return</span> <a class="code" href="classtf_1_1Executor.html#adca6cd0ce1bd7e6fa2ed2a55c9ae15e6">run_n</a>(f, repeat, [](){});</div><div class="line"><a name="l01186"></a><span class="lineno"> 1186</span>&#160;}</div><div class="line"><a name="l01187"></a><span class="lineno"> 1187</span>&#160;</div><div class="line"><a name="l01188"></a><span class="lineno"> 1188</span>&#160;<span class="comment">// Function: run_n</span></div><div class="line"><a name="l01189"></a><span class="lineno"> 1189</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> C&gt;</div><div class="line"><a name="l01190"></a><span class="lineno"><a class="line" href="classtf_1_1Executor.html#aff558312e64d19f98f26c91349c317da"> 1190</a></span>&#160;<a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/future.html">std::future&lt;void&gt;</a> <a class="code" href="classtf_1_1Executor.html#adca6cd0ce1bd7e6fa2ed2a55c9ae15e6">Executor::run_n</a>(<a class="code" href="classtf_1_1Taskflow.html">Taskflow</a>&amp; f, <span class="keywordtype">size_t</span> repeat, C&amp;&amp; c) {</div><div class="line"><a name="l01191"></a><span class="lineno"> 1191</span>&#160;  <span class="keywordflow">return</span> <a class="code" href="classtf_1_1Executor.html#a8acf7515e8e8fdda366ace68bcd65aa6">run_until</a>(</div><div class="line"><a name="l01192"></a><span class="lineno"> 1192</span>&#160;    f, [repeat]() <span class="keyword">mutable</span> { <span class="keywordflow">return</span> repeat-- == 0; }, std::forward&lt;C&gt;(c)</div><div class="line"><a name="l01193"></a><span class="lineno"> 1193</span>&#160;  );</div><div class="line"><a name="l01194"></a><span class="lineno"> 1194</span>&#160;}</div><div class="line"><a name="l01195"></a><span class="lineno"> 1195</span>&#160;</div><div class="line"><a name="l01196"></a><span class="lineno"> 1196</span>&#160;<span class="comment">// Function: run_until    </span></div><div class="line"><a name="l01197"></a><span class="lineno"> 1197</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> P&gt;</div><div class="line"><a name="l01198"></a><span class="lineno"><a class="line" href="classtf_1_1Executor.html#a8acf7515e8e8fdda366ace68bcd65aa6"> 1198</a></span>&#160;<a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/future.html">std::future&lt;void&gt;</a> <a class="code" href="classtf_1_1Executor.html#a8acf7515e8e8fdda366ace68bcd65aa6">Executor::run_until</a>(<a class="code" href="classtf_1_1Taskflow.html">Taskflow</a>&amp; f, P&amp;&amp; pred) {</div><div class="line"><a name="l01199"></a><span class="lineno"> 1199</span>&#160;  <span class="keywordflow">return</span> <a class="code" href="classtf_1_1Executor.html#a8acf7515e8e8fdda366ace68bcd65aa6">run_until</a>(f, std::forward&lt;P&gt;(pred), [](){});</div><div class="line"><a name="l01200"></a><span class="lineno"> 1200</span>&#160;}</div><div class="line"><a name="l01201"></a><span class="lineno"> 1201</span>&#160;</div><div class="line"><a name="l01202"></a><span class="lineno"> 1202</span>&#160;<span class="comment">// Function: _set_up_topology</span></div><div class="line"><a name="l01203"></a><span class="lineno"> 1203</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_set_up_topology(Topology* tpg) {</div><div class="line"><a name="l01204"></a><span class="lineno"> 1204</span>&#160;</div><div class="line"><a name="l01205"></a><span class="lineno"> 1205</span>&#160;  tpg-&gt;_sources.clear();</div><div class="line"><a name="l01206"></a><span class="lineno"> 1206</span>&#160;  tpg-&gt;_taskflow._graph.clear_detached();</div><div class="line"><a name="l01207"></a><span class="lineno"> 1207</span>&#160;  </div><div class="line"><a name="l01208"></a><span class="lineno"> 1208</span>&#160;  <span class="comment">// scan each node in the graph and build up the links</span></div><div class="line"><a name="l01209"></a><span class="lineno"> 1209</span>&#160;  <span class="keywordflow">for</span>(<span class="keyword">auto</span> node : tpg-&gt;_taskflow._graph._nodes) {</div><div class="line"><a name="l01210"></a><span class="lineno"> 1210</span>&#160;    </div><div class="line"><a name="l01211"></a><span class="lineno"> 1211</span>&#160;    node-&gt;_topology = tpg;</div><div class="line"><a name="l01212"></a><span class="lineno"> 1212</span>&#160;    node-&gt;_clear_state();</div><div class="line"><a name="l01213"></a><span class="lineno"> 1213</span>&#160;</div><div class="line"><a name="l01214"></a><span class="lineno"> 1214</span>&#160;    <span class="keywordflow">if</span>(node-&gt;num_dependents() == 0) {</div><div class="line"><a name="l01215"></a><span class="lineno"> 1215</span>&#160; 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     <span class="comment">// Back up lambda capture in case it has the topology pointer, to avoid it releasing on </span></div><div class="line"><a name="l01284"></a><span class="lineno"> 1284</span>&#160;      <span class="comment">// pop_front ahead of _mtx.unlock &amp; _promise.set_value. Released safely when leaving scope.</span></div><div class="line"><a name="l01285"></a><span class="lineno"> 1285</span>&#160;      <span class="keyword">auto</span> bc{ <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/utility/move.html">std::move</a>( tpg-&gt;_call ) };</div><div class="line"><a name="l01286"></a><span class="lineno"> 1286</span>&#160;</div><div class="line"><a name="l01287"></a><span class="lineno"> 1287</span>&#160;      f._topologies.pop_front();</div><div class="line"><a name="l01288"></a><span class="lineno"> 1288</span>&#160;</div><div class="line"><a name="l01289"></a><span class="lineno"> 1289</span>&#160;      f._mtx.unlock();</div><div class="line"><a name="l01290"></a><span class="lineno"> 1290</span>&#160;</div><div class="line"><a name="l01291"></a><span class="lineno"> 1291</span>&#160;      <span class="comment">// We set the promise in the end in case taskflow leaves before taskflow</span></div><div class="line"><a name="l01292"></a><span class="lineno"> 1292</span>&#160;      p.set_value();</div><div class="line"><a name="l01293"></a><span class="lineno"> 1293</span>&#160;</div><div class="line"><a name="l01294"></a><span class="lineno"> 1294</span>&#160;      _decrement_topology_and_notify();</div><div class="line"><a name="l01295"></a><span class="lineno"> 1295</span>&#160;    }</div><div class="line"><a name="l01296"></a><span class="lineno"> 1296</span>&#160;  }</div><div class="line"><a name="l01297"></a><span class="lineno"> 1297</span>&#160;}</div><div class="line"><a name="l01298"></a><span class="lineno"> 1298</span>&#160;</div><div class="line"><a name="l01299"></a><span class="lineno"> 1299</span>&#160;<span class="comment">// Function: run_until</span></div><div class="line"><a name="l01300"></a><span class="lineno"> 1300</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> P, <span class="keyword">typename</span> C&gt;</div><div class="line"><a name="l01301"></a><span class="lineno"><a class="line" href="classtf_1_1Executor.html#a85f5cd590d2dbe15d1f2f1f8d920a7e6"> 1301</a></span>&#160;<a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/future.html">std::future&lt;void&gt;</a> <a class="code" href="classtf_1_1Executor.html#a8acf7515e8e8fdda366ace68bcd65aa6">Executor::run_until</a>(<a class="code" href="classtf_1_1Taskflow.html">Taskflow</a>&amp; f, P&amp;&amp; pred, C&amp;&amp; c) {</div><div class="line"><a name="l01302"></a><span class="lineno"> 1302</span>&#160;</div><div class="line"><a name="l01303"></a><span class="lineno"> 1303</span>&#160;  _increment_topology();</div><div class="line"><a name="l01304"></a><span class="lineno"> 1304</span>&#160;</div><div class="line"><a name="l01305"></a><span class="lineno"> 1305</span>&#160;  <span class="comment">// Special case of predicate</span></div><div class="line"><a name="l01306"></a><span class="lineno"> 1306</span>&#160;  <span class="keywordflow">if</span>(f.<a class="code" href="classtf_1_1Taskflow.html#a224301842d94c44fd7fe99d8ac2ba241">empty</a>() || pred()) {</div><div class="line"><a name="l01307"></a><span class="lineno"> 1307</span>&#160;    <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/promise.html">std::promise&lt;void&gt;</a> promise;</div><div class="line"><a name="l01308"></a><span class="lineno"> 1308</span>&#160; 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 </div><div class="line"><a name="l01318"></a><span class="lineno"> 1318</span>&#160;  {</div><div class="line"><a name="l01319"></a><span class="lineno"> 1319</span>&#160;    <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/lock_guard.html">std::lock_guard&lt;std::mutex&gt;</a> lock(f._mtx);</div><div class="line"><a name="l01320"></a><span class="lineno"> 1320</span>&#160;</div><div class="line"><a name="l01321"></a><span class="lineno"> 1321</span>&#160;    <span class="comment">// create a topology for this run</span></div><div class="line"><a name="l01322"></a><span class="lineno"> 1322</span>&#160;    <span class="comment">//tpg = &amp;(f._topologies.emplace_back(f, std::forward&lt;P&gt;(pred), std::forward&lt;C&gt;(c)));</span></div><div class="line"><a name="l01323"></a><span class="lineno"> 1323</span>&#160;    f._topologies.emplace_back(f, std::forward&lt;P&gt;(pred), std::forward&lt;C&gt;(c));</div><div class="line"><a name="l01324"></a><span class="lineno"> 1324</span>&#160;    tpg = &amp;(f._topologies.back());</div><div class="line"><a name="l01325"></a><span class="lineno"> 1325</span>&#160;    future = tpg-&gt;_promise.get_future();</div><div class="line"><a name="l01326"></a><span class="lineno"> 1326</span>&#160;   </div><div class="line"><a name="l01327"></a><span class="lineno"> 1327</span>&#160;    <span class="keywordflow">if</span>(f._topologies.size() == 1) {</div><div class="line"><a name="l01328"></a><span class="lineno"> 1328</span>&#160;      run_now = <span class="keyword">true</span>;</div><div class="line"><a name="l01329"></a><span class="lineno"> 1329</span>&#160;      <span class="comment">//tpg-&gt;_bind(f._graph);</span></div><div class="line"><a name="l01330"></a><span class="lineno"> 1330</span>&#160;      <span class="comment">//_schedule(tpg-&gt;_sources);</span></div><div class="line"><a name="l01331"></a><span class="lineno"> 1331</span>&#160;    }</div><div class="line"><a name="l01332"></a><span class="lineno"> 1332</span>&#160;  }</div><div class="line"><a name="l01333"></a><span class="lineno"> 1333</span>&#160;  </div><div class="line"><a name="l01334"></a><span class="lineno"> 1334</span>&#160;  <span class="comment">// Notice here calling schedule may cause the topology to be removed sonner </span></div><div class="line"><a name="l01335"></a><span class="lineno"> 1335</span>&#160;  <span class="comment">// before the function leaves.</span></div><div class="line"><a name="l01336"></a><span class="lineno"> 1336</span>&#160;  <span class="keywordflow">if</span>(run_now) {</div><div class="line"><a name="l01337"></a><span class="lineno"> 1337</span>&#160;    _set_up_topology(tpg);</div><div class="line"><a name="l01338"></a><span class="lineno"> 1338</span>&#160;    _schedule(tpg-&gt;_sources);</div><div class="line"><a name="l01339"></a><span class="lineno"> 1339</span>&#160;  }</div><div class="line"><a name="l01340"></a><span class="lineno"> 1340</span>&#160;</div><div class="line"><a name="l01341"></a><span class="lineno"> 1341</span>&#160; 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 <a class="codeRef" doxygen="/Users/twhuang/PhD/Code/taskflow/doxygen/cppreference-doxygen-web.tag.xml:http://en.cppreference.com/w/" href="http://en.cppreference.com/w/cpp/thread/lock_guard.html">std::lock_guard&lt;std::mutex&gt;</a> lock(_topology_mutex);</div><div class="line"><a name="l01353"></a><span class="lineno"> 1353</span>&#160;  <span class="keywordflow">if</span>(--_num_topologies == 0) {</div><div class="line"><a name="l01354"></a><span class="lineno"> 1354</span>&#160;    _topology_cv.notify_all();</div><div class="line"><a name="l01355"></a><span class="lineno"> 1355</span>&#160;  }</div><div class="line"><a name="l01356"></a><span class="lineno"> 1356</span>&#160;}</div><div class="line"><a name="l01357"></a><span class="lineno"> 1357</span>&#160;</div><div class="line"><a name="l01358"></a><span class="lineno"> 1358</span>&#160;<span class="comment">// Procedure: _decrement_topology</span></div><div class="line"><a name="l01359"></a><span class="lineno"> 1359</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> Executor::_decrement_topology() {</div><div class="line"><a name="l01360"></a><span class="lineno"> 1360</span>&#160; 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 std::enable_if_t&lt;is_cudaflow_task_v&lt;C&gt;, <span class="keywordtype">void</span>&gt;*</div><div class="line"><a name="l01402"></a><span class="lineno"> 1402</span>&#160;&gt;</div><div class="line"><a name="l01403"></a><span class="lineno"><a class="line" href="classtf_1_1FlowBuilder.html#afdf47fd1a358fb64f8c1b89e2a393169"> 1403</a></span>&#160;<a class="code" href="classtf_1_1Task.html">Task</a> <a class="code" href="classtf_1_1FlowBuilder.html#afdf47fd1a358fb64f8c1b89e2a393169">FlowBuilder::emplace_on</a>(C&amp;&amp; callable, D&amp;&amp; device) {</div><div class="line"><a name="l01404"></a><span class="lineno"> 1404</span>&#160;  <span class="keyword">auto</span> n = <a class="code" href="classtf_1_1FlowBuilder.html#a9404a57d9d37a4d49d20b686e4e5f68f">_graph</a>.emplace_back(</div><div class="line"><a name="l01405"></a><span class="lineno"> 1405</span>&#160;    std::in_place_type_t&lt;Node::cudaFlowTask&gt;{},</div><div class="line"><a name="l01406"></a><span class="lineno"> 1406</span>&#160;    [c=std::forward&lt;C&gt;(callable), d=std::forward&lt;D&gt;(device)]</div><div class="line"><a name="l01407"></a><span class="lineno"> 1407</span>&#160;    (<a class="code" href="classtf_1_1Executor.html">Executor</a>&amp; executor, Node* node) <span class="keyword">mutable</span> {</div><div class="line"><a name="l01408"></a><span class="lineno"> 1408</span>&#160;      <a class="code" href="classtf_1_1cudaScopedDevice.html">cudaScopedDevice</a> ctx(d);</div><div class="line"><a name="l01409"></a><span class="lineno"> 1409</span>&#160;      executor._invoke_cudaflow_task_entry(c, node);</div><div class="line"><a name="l01410"></a><span class="lineno"> 1410</span>&#160;    }</div><div class="line"><a name="l01411"></a><span class="lineno"> 1411</span>&#160;  );</div><div class="line"><a name="l01412"></a><span class="lineno"> 1412</span>&#160;  <span class="keywordflow">return</span> <a class="code" href="classtf_1_1Task.html">Task</a>(n);</div><div class="line"><a name="l01413"></a><span class="lineno"> 1413</span>&#160;}</div><div class="line"><a name="l01414"></a><span class="lineno"> 1414</span>&#160;</div><div class="line"><a name="l01415"></a><span class="lineno"> 1415</span>&#160;<span class="comment">// Procedure: offload_until</span></div><div class="line"><a name="l01416"></a><span class="lineno"> 1416</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> P&gt;</div><div class="line"><a name="l01417"></a><span class="lineno"><a class="line" href="classtf_1_1cudaFlow.html#a99358da15e3bdfa1faabb3e326130e1f"> 1417</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="classtf_1_1cudaFlow.html#a99358da15e3bdfa1faabb3e326130e1f">cudaFlow::offload_until</a>(P&amp;&amp; predicate) {</div><div class="line"><a name="l01418"></a><span class="lineno"> 1418</span>&#160;</div><div class="line"><a name="l01419"></a><span class="lineno"> 1419</span>&#160;  <span class="keywordflow">if</span>(!_joinable) {</div><div class="line"><a name="l01420"></a><span class="lineno"> 1420</span>&#160;    TF_THROW(<span class="stringliteral">&quot;cudaFlow already joined&quot;</span>);</div><div class="line"><a name="l01421"></a><span class="lineno"> 1421</span>&#160;  }</div><div class="line"><a name="l01422"></a><span class="lineno"> 1422</span>&#160;</div><div class="line"><a name="l01423"></a><span class="lineno"> 1423</span>&#160;  _executor._invoke_cudaflow_task_external(</div><div class="line"><a name="l01424"></a><span class="lineno"> 1424</span>&#160;    *<span class="keyword">this</span>, std::forward&lt;P&gt;(predicate), <span class="keyword">false</span></div><div class="line"><a name="l01425"></a><span class="lineno"> 1425</span>&#160;  );</div><div class="line"><a name="l01426"></a><span class="lineno"> 1426</span>&#160;}</div><div class="line"><a name="l01427"></a><span class="lineno"> 1427</span>&#160;</div><div class="line"><a name="l01428"></a><span class="lineno"> 1428</span>&#160;<span class="comment">// Procedure: offload_n</span></div><div class="line"><a name="l01429"></a><span class="lineno"><a class="line" href="classtf_1_1cudaFlow.html#ac2269fd7dc8ca04a294a718204703dad"> 1429</a></span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classtf_1_1cudaFlow.html#ac2269fd7dc8ca04a294a718204703dad">cudaFlow::offload_n</a>(<span class="keywordtype">size_t</span> n) {</div><div class="line"><a name="l01430"></a><span class="lineno"> 1430</span>&#160;  <a class="code" href="classtf_1_1cudaFlow.html#a99358da15e3bdfa1faabb3e326130e1f">offload_until</a>([repeat=n] () <span class="keyword">mutable</span> { <span class="keywordflow">return</span> repeat-- == 0; });</div><div class="line"><a name="l01431"></a><span class="lineno"> 1431</span>&#160;}</div><div class="line"><a name="l01432"></a><span class="lineno"> 1432</span>&#160;</div><div class="line"><a name="l01433"></a><span class="lineno"> 1433</span>&#160;<span class="comment">// Procedure: offload</span></div><div class="line"><a name="l01434"></a><span class="lineno"><a class="line" href="classtf_1_1cudaFlow.html#a85789ed8a1f47704cf1f1a2b98969444"> 1434</a></span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classtf_1_1cudaFlow.html#a85789ed8a1f47704cf1f1a2b98969444">cudaFlow::offload</a>() {</div><div class="line"><a name="l01435"></a><span class="lineno"> 1435</span>&#160;  <a class="code" href="classtf_1_1cudaFlow.html#a99358da15e3bdfa1faabb3e326130e1f">offload_until</a>([repeat=1] () <span class="keyword">mutable</span> { <span class="keywordflow">return</span> repeat-- == 0; });</div><div class="line"><a name="l01436"></a><span class="lineno"> 1436</span>&#160;}</div><div class="line"><a name="l01437"></a><span class="lineno"> 1437</span>&#160;</div><div class="line"><a name="l01438"></a><span class="lineno"> 1438</span>&#160;<span class="comment">// Procedure: join_until</span></div><div class="line"><a name="l01439"></a><span class="lineno"> 1439</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> P&gt;</div><div class="line"><a name="l01440"></a><span class="lineno"><a class="line" href="classtf_1_1cudaFlow.html#aea77b710bf74fb3ccc6043592d4cdbc7"> 1440</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="classtf_1_1cudaFlow.html#aea77b710bf74fb3ccc6043592d4cdbc7">cudaFlow::join_until</a>(P&amp;&amp; predicate) {</div><div class="line"><a name="l01441"></a><span class="lineno"> 1441</span>&#160;</div><div class="line"><a name="l01442"></a><span class="lineno"> 1442</span>&#160;  <span class="keywordflow">if</span>(!_joinable) {</div><div class="line"><a name="l01443"></a><span class="lineno"> 1443</span>&#160;    TF_THROW(<span class="stringliteral">&quot;cudaFlow already joined&quot;</span>);</div><div class="line"><a name="l01444"></a><span class="lineno"> 1444</span>&#160;  }</div><div class="line"><a name="l01445"></a><span class="lineno"> 1445</span>&#160;  _executor._invoke_cudaflow_task_external(</div><div class="line"><a name="l01446"></a><span class="lineno"> 1446</span>&#160;    *<span class="keyword">this</span>, std::forward&lt;P&gt;(predicate), <span class="keyword">true</span></div><div class="line"><a name="l01447"></a><span class="lineno"> 1447</span>&#160;  );</div><div class="line"><a name="l01448"></a><span class="lineno"> 1448</span>&#160;  _joinable = <span class="keyword">false</span>;</div><div class="line"><a name="l01449"></a><span class="lineno"> 1449</span>&#160;}</div><div class="line"><a name="l01450"></a><span class="lineno"> 1450</span>&#160;</div><div class="line"><a name="l01451"></a><span class="lineno"> 1451</span>&#160;<span class="comment">// Procedure: join_n</span></div><div class="line"><a name="l01452"></a><span class="lineno"><a class="line" href="classtf_1_1cudaFlow.html#a9b28ad99e4d3c0208422a2db094df277"> 1452</a></span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classtf_1_1cudaFlow.html#a9b28ad99e4d3c0208422a2db094df277">cudaFlow::join_n</a>(<span class="keywordtype">size_t</span> n) {</div><div class="line"><a name="l01453"></a><span class="lineno"> 1453</span>&#160;  <a class="code" href="classtf_1_1cudaFlow.html#aea77b710bf74fb3ccc6043592d4cdbc7">join_until</a>([repeat=n] () <span class="keyword">mutable</span> { <span class="keywordflow">return</span> repeat-- == 0; });</div><div class="line"><a name="l01454"></a><span class="lineno"> 1454</span>&#160;}</div><div class="line"><a name="l01455"></a><span class="lineno"> 1455</span>&#160;</div><div class="line"><a name="l01456"></a><span class="lineno"> 1456</span>&#160;<span class="comment">// Procedure: join</span></div><div class="line"><a name="l01457"></a><span class="lineno"><a class="line" href="classtf_1_1cudaFlow.html#afa479a33e555179c400ba2376b7c5f29"> 1457</a></span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classtf_1_1cudaFlow.html#afa479a33e555179c400ba2376b7c5f29">cudaFlow::join</a>() {</div><div class="line"><a name="l01458"></a><span class="lineno"> 1458</span>&#160;  <a class="code" href="classtf_1_1cudaFlow.html#aea77b710bf74fb3ccc6043592d4cdbc7">join_until</a>([repeat=1] () <span class="keyword">mutable</span> { <span class="keywordflow">return</span> repeat-- == 0; });</div><div class="line"><a name="l01459"></a><span class="lineno"> 1459</span>&#160;}</div><div class="line"><a name="l01460"></a><span class="lineno"> 1460</span>&#160;</div><div class="line"><a name="l01461"></a><span class="lineno"> 1461</span>&#160;<span class="preprocessor">#endif  </span></div><div class="line"><a name="l01462"></a><span class="lineno"> 1462</span>&#160;</div><div class="line"><a name="l01463"></a><span class="lineno"> 1463</span>&#160;}  <span class="comment">// end of namespace tf -----------------------------------------------------</span></div><div class="line"><a name="l01464"></a><span class="lineno"> 1464</span>&#160;</div><div class="line"><a name="l01465"></a><span class="lineno"> 1465</span>&#160;</div><div class="line"><a name="l01466"></a><span class="lineno"> 1466</span>&#160;</div><div class="ttc" id="classtf_1_1Executor_html_a6487d589cb1f6b078b69fd3bb1082345"><div class="ttname"><a href="classtf_1_1Executor.html#a6487d589cb1f6b078b69fd3bb1082345">tf::Executor::this_worker_id</a></div><div class="ttdeci">int this_worker_id() const</div><div class="ttdoc">queries the id of the caller thread in this executor </div><div class="ttdef"><b>Definition:</b> executor.hpp:450</div></div>
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<div class="ttc" id="classtf_1_1cudaFlow_html_aea77b710bf74fb3ccc6043592d4cdbc7"><div class="ttname"><a href="classtf_1_1cudaFlow.html#aea77b710bf74fb3ccc6043592d4cdbc7">tf::cudaFlow::join_until</a></div><div class="ttdeci">void join_until(P &amp;&amp;predicate)</div><div class="ttdoc">offloads the cudaFlow with the given stop predicate and then joins the execution </div><div class="ttdef"><b>Definition:</b> executor.hpp:1440</div></div>
<div class="ttc" id="classtf_1_1TFProfObserver_html_a663445b21a03abaccfd32b199b7b10a1"><div class="ttname"><a href="classtf_1_1TFProfObserver.html#a663445b21a03abaccfd32b199b7b10a1">tf::TFProfObserver::dump</a></div><div class="ttdeci">void dump(T &amp;ostream) const</div><div class="ttdoc">dumps the timelines into a Taskflow Profiler format through an output stream object that defines stre...</div><div class="ttdef"><b>Definition:</b> observer.hpp:489</div></div>
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<div class="ttc" id="move_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/utility/move.html">std::move</a></div><div class="ttdeci">T move(T... args)</div></div>
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<div class="ttc" id="vector_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt; Worker &gt;</a></div></div>
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<div class="ttc" id="classtf_1_1cudaFlow_html_a99358da15e3bdfa1faabb3e326130e1f"><div class="ttname"><a href="classtf_1_1cudaFlow.html#a99358da15e3bdfa1faabb3e326130e1f">tf::cudaFlow::offload_until</a></div><div class="ttdeci">void offload_until(P &amp;&amp;predicate)</div><div class="ttdoc">offloads the cudaFlow onto a GPU and repeatedly running it until the predicate becomes true ...</div><div class="ttdef"><b>Definition:</b> executor.hpp:1417</div></div>
<div class="ttc" id="classtf_1_1cudaFlow_html_a85789ed8a1f47704cf1f1a2b98969444"><div class="ttname"><a href="classtf_1_1cudaFlow.html#a85789ed8a1f47704cf1f1a2b98969444">tf::cudaFlow::offload</a></div><div class="ttdeci">void offload()</div><div class="ttdoc">offloads the cudaFlow and executes it once </div><div class="ttdef"><b>Definition:</b> executor.hpp:1434</div></div>
<div class="ttc" id="classtf_1_1FlowBuilder_html_afdf47fd1a358fb64f8c1b89e2a393169"><div class="ttname"><a href="classtf_1_1FlowBuilder.html#afdf47fd1a358fb64f8c1b89e2a393169">tf::FlowBuilder::emplace_on</a></div><div class="ttdeci">Task emplace_on(C &amp;&amp;callable, D &amp;&amp;device)</div><div class="ttdoc">creates a cudaflow task on the given device </div><div class="ttdef"><b>Definition:</b> executor.hpp:1403</div></div>
<div class="ttc" id="classtf_1_1Executor_html_ab92083be20ea77b9fb3eb8ea2d26af68"><div class="ttname"><a href="classtf_1_1Executor.html#ab92083be20ea77b9fb3eb8ea2d26af68">tf::Executor::num_observers</a></div><div class="ttdeci">size_t num_observers() const</div><div class="ttdoc">queries the number of observers </div><div class="ttdef"><b>Definition:</b> executor.hpp:679</div></div>
<div class="ttc" id="classtf_1_1Executor_html"><div class="ttname"><a href="classtf_1_1Executor.html">tf::Executor</a></div><div class="ttdoc">execution interface for running a taskflow graph </div><div class="ttdef"><b>Definition:</b> executor.hpp:28</div></div>
<div class="ttc" id="classtf_1_1Executor_html_a79223c7f32c9d715e725b8d775de2d29"><div class="ttname"><a href="classtf_1_1Executor.html#a79223c7f32c9d715e725b8d775de2d29">tf::Executor::num_workers</a></div><div class="ttdeci">size_t num_workers() const</div><div class="ttdoc">queries the number of worker threads (can be zero) </div><div class="ttdef"><b>Definition:</b> executor.hpp:392</div></div>
<div class="ttc" id="classtf_1_1Executor_html_a6d6c28ed58211e4c27a99571e5bf0b6c"><div class="ttname"><a href="classtf_1_1Executor.html#a6d6c28ed58211e4c27a99571e5bf0b6c">tf::Executor::num_topologies</a></div><div class="ttdeci">size_t num_topologies() const</div><div class="ttdoc">queries the number of running topologies at the time of this call </div><div class="ttdef"><b>Definition:</b> executor.hpp:402</div></div>
<div class="ttc" id="mersenne_twister_engine_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/numeric/random/mersenne_twister_engine.html">std::mt19937</a></div></div>
<div class="ttc" id="classtf_1_1Subflow_html"><div class="ttname"><a href="classtf_1_1Subflow.html">tf::Subflow</a></div><div class="ttdoc">class to construct a subflow graph from the execution of a dynamic task </div><div class="ttdef"><b>Definition:</b> flow_builder.hpp:740</div></div>
<div class="ttc" id="classtf_1_1Executor_html_adca6cd0ce1bd7e6fa2ed2a55c9ae15e6"><div class="ttname"><a href="classtf_1_1Executor.html#adca6cd0ce1bd7e6fa2ed2a55c9ae15e6">tf::Executor::run_n</a></div><div class="ttdeci">std::future&lt; void &gt; run_n(Taskflow &amp;taskflow, size_t N)</div><div class="ttdoc">runs the taskflow for N times </div><div class="ttdef"><b>Definition:</b> executor.hpp:1184</div></div>
<div class="ttc" id="classtf_1_1cudaFlow_html_a9b28ad99e4d3c0208422a2db094df277"><div class="ttname"><a href="classtf_1_1cudaFlow.html#a9b28ad99e4d3c0208422a2db094df277">tf::cudaFlow::join_n</a></div><div class="ttdeci">void join_n(size_t N)</div><div class="ttdoc">offloads the cudaFlow and executes it by the given times, and then joins the execution ...</div><div class="ttdef"><b>Definition:</b> executor.hpp:1452</div></div>
<div class="ttc" id="classtf_1_1Subflow_html_a59fcac1323e70d920088dd37bd0be245"><div class="ttname"><a href="classtf_1_1Subflow.html#a59fcac1323e70d920088dd37bd0be245">tf::Subflow::join</a></div><div class="ttdeci">void join()</div><div class="ttdoc">enables the subflow to join its parent task </div><div class="ttdef"><b>Definition:</b> executor.hpp:1374</div></div>
<div class="ttc" id="classtf_1_1Executor_html_ab9aa252f70e9a40020a1e5a89d485b85"><div class="ttname"><a href="classtf_1_1Executor.html#ab9aa252f70e9a40020a1e5a89d485b85">tf::Executor::wait_for_all</a></div><div class="ttdeci">void wait_for_all()</div><div class="ttdoc">wait for all pending graphs to complete </div><div class="ttdef"><b>Definition:</b> executor.hpp:1365</div></div>
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